Glossary

100 year Floodplain

Flood zones are defined by the Federal Emergency Management Agency (FEMA) to identify varying levels of flood risk and inform the Flood Insurance Rate Map. Floods are the second-most common natural disaster, and they often occur quickly in low-lying areas after heavy rains. The 100-year floodplain is the area that has a 1-percent-annual-chance of flooding and is also referred to as the base flood, while moderate flood hazard areas are between the limits of the base flood and the 0.2-percent-annual-chance or 500-year flood.

Source: FEMA, 03/18/2019 - 17:11 Last updated May 21, 2019
500-year Floodplain

Flood zones are defined by the Federal Emergency Management Agency (FEMA) to identify varying levels of flood risk and inform the Flood Insurance Rate Map. Floods are the second-most common natural disaster, and they often occur quickly in low-lying areas after heavy rains. The 500-year floodplain is the area that has a 0.2-percent annual chance of flooding and is also referred to as the moderate flood hazard area. These are between the limits of the 1-percent-annual-chance (base flood) and the 0.2-percent-annual-chance.

Source: FEMA, 03/18/2019 - 17:11 Last updated May 21, 2019
Aboveground live carbon storage

The amount of carbon stored in live vegetation such as trees, shrubs, and grasses. A common method to estimate aboveground carbon includes transferring calculations of biomass sampled at the plot scale to remotely-sensed data such as satellite imagery or aerial LiDAR, using metrics such as vegetation type, size class, and canopy density. Broadcasting individual biomass samples to remotely-sensed data enables wide-area estimation of carbon storage.

Source: Gonzalez et al., 2015 Minimum Acreage Threshold: 100.0 acres Last updated May 21, 2019
Agricultural Buffer Transition Area

Jurisdiction: Gilroy. Protection: The agricultural buffer/agricultural transition area shall be a minimum of 150 feet measured from the edge of the agricultural, agricultural preserve, greenbelt area. No public access shall be allowed in this transition area due to the potential for complaints about and exposure to the dust and spraying associated with agricultural activities. Agricultural mitigation requires equal protection (1:1 ratio) for the loss of agricultural lands that no longer will be designated agricultural land due to conversion to urban uses.

Source: City of Gilroy General Plan Draft EIR Last updated June 10, 2019
Agricultural Conservation Area

Jurisdiction: Brentwood. Protection: Preserve designated agricultural lands in Brentwood's Planning Area. For example, the City's policies require the use of buffers such as greenbelts, drainage features, parks, or other improved and maintained features in order to separate residential and other sensitive land uses, such as schools and hospitals, from agricultural lands and agricultural operations. 

Source: City of Brentwood General Plan Last updated June 10, 2019
Agricultural Enterprise Area

Jurisdiction: San Mateo County. Protection: Privately owned lands meeting zoning designation and general land use criteria for eligibility under the Williamson Act for landowners considering entering into an Agricultural Preserve and Williamson Act contract. The Area is non-regulatory and non-obligatory.

Source: San Mateo County (Land Conservation) Act Last updated June 10, 2019
Agricultural lands

California's Farmland Mapping and Monitoring Program (FMMP) produces maps and statistical data used for analyzing impacts on California’s agricultural resources. Agricultural land is rated according to soil quality and irrigation status; the best quality land is called Prime Farmland. The maps are updated every two years. In addition to categorizing the quality of agricultural lands as Prime, Statewide, or Unique, counties can also designate land as farmland of Local Importance.  

Source: California Farmland Mapping and Monitoring Program Last updated June 7, 2019
Agricultural policies

Jurisdictional policies adopted to protect farms and ranches from urban development. Policies include Napa County's Measure J (extended to 2058 as Measure P in 2008) and Solano County's Orderly Growth Initiative (extended to 2028 as Measure T in 2008), in which changes to General Plan policies describing intent, minimum parcel size and maximum building intensity of lands designated "Agricultural Resource" or "Agriculture, Watershed, Open Space" cannot occur unless approved by the voters. Includes city and county area policies that prioritize agricultural conservation of natural resources and preservation of farms and ranches, based upon counties' general plans and zoning maps.

Source: Greenbelt Alliance, 2017 Last updated May 21, 2019
Agricultural Priority Area

Jurisdiction: Morgan Hill. Protection: Agricultural Priority Areas are identified as Morgan Hill's first priority for conservation inside the city's sphere of influence.

Alameda Whipsnake

Jurisdiction: U.S. Fish & Wildlife Service, Alameda County, Contra Costa County. Protection: When a species is proposed for listing as endangered or threatened under the U.S. Endangered Species Act, the U.S. Fish and Wildlife Service (USFWS) must consider whether there are areas of habitat believed to be essential to the species' conservation. Those areas may be proposed for designation as critical habitat. Critical habitat for the Alameda whipsnake was designated by USFWS in 2006. 

Source: U.S. Fish & Wildlife Service, Critical Habitat Rule, October 2, 2006. Last updated May 23, 2019
Altamont Pass Wind Resource Area

Jurisdiction: U.S. Fish & Wildlife Service, Alameda County, Contra Costa County. Protection: The Altamont Pass Wind Resources Area Conservation Plan is being developed to minimize impacts to birds caused by wind turbines, and conserve birds and other terrestrial species while allowing wind energy development and operations in the area.

Antioch Dunes Evening-Primrose

Jurisdiction: U.S. Fish & Wildlife Service, California Department of Fish & Wildlife, Alameda County, Contra Costa County. Protection: Antioch Dunes evening-primrose is a California endangered plant species, which means that killing or possession of plants collected from the wild is prohibited by the California Endangered Species Act (CESA). Antioch Dunes evening-primrose is a short-lived perennial plant found at the Antioch Dunes National Wildlife Refuge. 

Source: CA Department of Fish & Wildlife Last updated May 23, 2019
At Risk of Urban Development 2017

The At Risk analysis evaluates development pressure on open space surrounding the region’s cities, policy protection measures to protect or minimize impact to the land, and the interweaving natural and agricultural values and benefits that tell the story of these Bay Area greenbelt landscapes. This research models the cumulative strength of natural value policy protection measures against the overlapping development pressure factors to derive an At Risk score that approximates the likelihood of urban development for a given area.This land development assessment is then reported in time horizons. Land at high risk is likely to be developed within 10 years; land at medium risk is likely to be developed within30 years, and low risk land as unlikely to develop in the next 30 years.

Source: Greenbelt Alliance Last updated May 23, 2019
Baker's Larkspur

Jurisdiction: U.S. Fish & Wildlife Service, California Department of Fish & Wildlife, Alameda County, Contra Costa County. Protection: Baker’s larkspur is a California endangered plant species, which means that killing or possessing plants is prohibited by the California Endangered Species Act (CESA). The species is also listed as endangered under the federal Endangered Species Act. 

Source: California Department of Fish & Wildlife Last updated May 23, 2019
Bay Area Critical Linkages - Large landscape Blocks

Large Landscape Blocks are areas of high ecological integrity that build upon existing protected areas and serve as the end points for the Critical Linkages. The California Protected Areas Database and Conservation Easements were used as the foundation to delineate large landscape blocks for the greater Bay Area. Protected areas were aggregated if within 500m of each other (easements whose primary purpose was agriculture, farmland, or cultural/historical were excluded from this step). Urban land was then removed from the resulting 500m aggregation to ensure only natural, grazing, and agriculture land was included in the aggregation, along with protected lands and conservation easements. A roadless area analysis was then conducted to identify areas of high ecological integrity.

Source: Bay Area Open Space Council, Conservation Lands Network Last updated May 23, 2019
Bay Area Critical Linkages - Linkage

The broader regions of connectivity important to facilitate the movement of multiple species and maintain ecological processes. The Bay Area Critical Linkages is a network of habitat linkages designed for a number of focal species. These linkages, together with the large landscape blocks they connect and the key riparian corridors, buffer zones, and important baylands they encompass, represent the mosaic of habitat needed for conserving biodiversity. The Bay Area Critical Linkages is meant to build upon our existing conservation investments and identify those areas needed to maintain those investments.

Source: Bay Area Open Space Council, Conservation Lands Network Last updated May 23, 2019
Bay Checkerspot Butterfly

Jurisdiction: U.S. Fish & Wildlife Service, Alameda County, Contra Costa County. Protection: This species has been listed by the USFWS as threatened, meaning the species is likely to become endangered in the foreseeable future throughout all or a significant portion of its range, but they are not in danger of extinction right now. Critical habitat was finalized for this species in 2008.

Source: U.S. Fish & Wildlife Service Last updated May 23, 2019
Bay/Delta Conservation Plan (NCCP/HCP)

Jurisdiction: California Department of Water Resources, U.S. Bureau of Reclamation. Protection: The Plan goals are to provide for the conservation and management of endangered and threatened species through habitat preservation and restoration as well as to streamline the environmental permitting process for water projects and some development in the Sacramento-San Joaquin Delta region.

Source: CA Department of Water Resources Last updated May 23, 2019
Baylands

The San Francisco Bay has lost an estimated 85 percent of its historic wetlands to development or other alteration. Thus, all remaining wetland habitat is a conservation priority. The San Francisco Estuary Institute's (SFEI) map of modern baylands shows remnant tidal marsh, as well as filled and diked former baylands. Learn more about the baylands at http://www.sfei.org/ecoatlas.

Source: San Franciso Estuary Institute, BBARI v2 Last updated May 23, 2019
Baylands policy

The areas identified as important for protection and conservation falling under the jurisdiction of the Bay Conservation and Development Commission (BCDC). The Commission holds authority over development projects within the San Francisco Bay region, including Suisun, San Pablo, Honker, Richardson, San Rafael, San Leandro and Grizzly Bays and the Carquinez Strait; certain waterways that flow into the Bay; certain salt ponds or managed wetlands around the Bay; a shoreline band jurisdiction which extends 100 feet inland from the Bay; and the Suisun Marsh. Data layer created by Greenbelt Alliance based upon plan maps and jurisdictional coverage description available through San Francisco Bay Plan website.

Source: Greenbelt Alliance Last updated May 23, 2019
BCDC Jurisdiction and Authority

Jurisdiction: San Francisco Bay Conservation and Development Commission (BCDC). Protection: BCDC is a California state planning and regulatory agency with regional authority over the San Francisco Bay, the Bay’s shoreline band, and the Suisun Marsh. Its mission is to protect and enhance San Francisco Bay and to encourage the Bay’s responsible and productive use for this and future generations. State law requires sponsors of projects that propose to fill or extract materials from the Bay to apply for a BCDC permit. In addition to minimizing any fill required for an appropriate project and ensuring that the project is compatible with the conservation of Bay resources, BCDC is tasked with requiring maximum feasible public access within the Bay’s 100-foot shoreline band.

Source: San Francisco Bay Conservation and Development Commission Last updated May 23, 2019
Benicia General Plan: Visual Character

Jurisdiction: Benicia. Protection: Ensure that new development is compatible with the surrounding architectural and neighborhood character. Require preservation of open space corridors between Lake Herman, Sulphur Springs Mountain, the Northern Area, the northeast hills, the Benicia State Recreation Area, and the marshlands east of I-680.

Source: City of Benicia General Plan Last updated June 10, 2019
Bicycle Routes

This data set uses the following bike path classifications from cities and counties throughout the region:

Class I: Off-Street Shared-Use Path - A bikeway physically separated from motorized vehicular traffic by an open space or barrier. Pedestrians, skaters, wheelchair users, joggers, and other non-motorized users typically use shared-use paths.

Class II: Bike Lane - Portion of the roadway that has been designated by striping, signing and pavement markings for the preferential or exclusive use of bicycles. Some cities and counties also define wide shoulders as bike lanes. Always ride about 4 feet from parked cars to avoid the door zone.

Class III: On-Street Bike Route - Any road or street designated for bicycle travel. These routes are not for the exclusive use of cyclists. Often, routes include residential streets with low auto volumes and speeds.

Source: MTC, April 2018 Last updated May 24, 2019
Biological Resources (NHR-A.1.3)

Jurisdiction: Union City. Protection: On sites that have the potential to contain critical or sensitive habitats, or special-species, or are within 100 feet of such areas, the City shall require the project applicant to survey the site by a qualified biologist at the proper time of year. Appropriate mitigation measures will be incorporated into the project as necessary to protect the resources.

Source: City of Union City General Plan Last updated June 10, 2019
Biological Resources: Overlay Plan

Jurisdiction: Alameda County, Castro Valley. Protection: Limit the amount of impervious surface within 100 feet of the top of the creek bed channel to limit erosion and acceleration of water flow into the creek channel. The city protects natural wildlife via conservation. This will feature open space connected to large habitat areas. Conservation encourages landowners to initiate easements that protects wildlife.

Source: Castro Valley General Plan, Alameda County Community Development Agency Last updated May 24, 2019
Biological Resources (Policy 7-1.1.B)

Jurisdiction: Fremont. Protection: Evaluate development within 100 feet of the top of bank of riparian areas and water bodies, including creeks, lakes, ponds, marshes, and vernal pools. This distance shall be increased to 200 feet in areas above the toe of the hill. Carefully assess the extent and characteristics of riparian corridors and creeks to a minimum distance of 100 feet from the top of bank below the toe of the hill and 200 feet from the top of bank above the toe of the hill. 

Source: City of Fremont General Plan Last updated May 24, 2019
Biology and Natural Resources (Policy 4-P-1)

Jurisdiction: Petaluma. Protection: Create setbacks for all tributaries to the Petaluma River extending a minimum of 50 feet outward from the top of each bank, with extended buffers where significant habitat areas, vernal pools, or wetlands exist. Development shall not occur within this setback, except as part of greenway enhancement (for example, trails and bikeways). 

Source: City of Petaluma General Plan Last updated May 24, 2019
Briones Hills Agricultural Preservation Area

Jurisdiction: Contra Costa County, Martinez, Pleasant Hill, Walnut Creek, Lafayette, Orinda, Richmond, Pinole, and Hercules. Protection:  The Briones Hills Agricultural Preserve Area Compact was made in 1988 between Contra Costy County and the Cities of Martinez, Pleasant Hill, Walnut Creek, Lafayette, Orinda, Richmond, Pinole, and Hercules. The signatories agree not to annex lands in the Briones Hills planning area for urban development. This area also includes East Bay Regional Park District lands and large tracts of agricultural land east of EBMUD watershed lands.

Source: East Bay Municipal Utility District, Watershed Master Plan Last updated May 24, 2019
California Assembly District

The California Assembly is the lower house of California State Legislature that first votes on resolutions before the California State Senate.There are 80 districts within California each with one representative in the assembly.

Source: State of California, 2019 Last updated May 24, 2019
California Coastal Commission

Jurisdiction: CA Coastal Commission Protection: Along with the Bay Conservation and Development Commission (BCDC), and the California Coastal Conservancy, the Coastal Commission is one of California's three designated coastal management agencies for the purpose of administering the federal Coastal Zone Management Act (CZMA) in California. Under California's federally-approved Coastal Management Program, the California Coastal Commission manages development along the California coast except for San Francisco Bay, where the San Francisco Bay Conservation and Development Commission oversees development. The third agency, the California Coastal Conservancy, purchases, protects, restores, and enhances coastal resources. The primary authorities for the Coastal Program are the California Coastal Act, McAteer-Petris Act, and Suisan Marsh Preservation Act.

Source: California Coastal Commission Last updated May 24, 2019
California Red-Legged Frog

Jurisdiction: U.S. Fish & Wildlife Service, Alameda County, Contra Costa County. Protection: the California red-legged frog is federally listed under the Endangered Species Act as a threatened species throughout its range in California. Critical habitat was revised and finalized for this species by USFWS in 2010. 

Source: U.S. Fish & Wildlife Service Last updated May 24, 2019
California Senate District

The California State Senate is the upper house of the California State Legislature. There are a total of 40 senate districts within California.

Source: State of California, 2019 Last updated May 24, 2019
California Tiger Salamander

Jurisdiction: U.S. Fish & Wildlife Service, Alameda County, Contra Costa County. Protection: The California tiger salamanders around Sonoma County and Santa Barbara are endangered, which means they are in danger of extinction throughout all or a significant portion of its range. California tiger salamanders in the Central Valley are threatened. The species is likely to become endangered in the foreseeable future throughout all or a significant portion of its range, but they are not in danger of extinction right now. USFWS designated critical habitat for this species in 2011.

Source: U.S. Fish & Wildlife Service Last updated May 24, 2019
CA Storie Index

Preserving prime agricultural lands and open space is a key statutory mandate of California's Local Agency Formation Commissions (Cortese-Knox Hertzberg Act 2000, Gov. Code §56301). The Storie Index is a soil rating based on soil characteristics that govern the land's potential utilization and agricultural capacity; lands with an index score of 80-100 are statutorily defined as prime agricultural land. This land valuation is independent of other physical or economic factors that might determine the desirability of growing certain plants in a given location. The characteristics evaluated include suitable soil profiles, surface texture, slope, and dynamic properties. 

Source: USDA - Soil Survey Geographic Database Last updated June 5, 2019
Chinook Salmon (Threatened)

Jurisdiction: U.S. Fish & Wildlife Service, Alameda County, Contra Costa County. Protection: Chinook have been classified into six major groups, or Evolutionarily Significant Units (ESUs) by NOAA Fisheries. The California Coastal Chinook Salmon ESU includes all natural spawning populations of Chinook Salmon from rivers and streams south of the Klamath River to the Russian River. Due to concern over depressed population sizes relative to historical abundance, California Coastal Chinook Salmon was federally listed as threatened in 1999. 

Source: California Department of Fish & Wildlife Last updated May 24, 2019
City Limits

A city's boundary that defines where urban services and utilities are provided.

Source: California Department of Forestry and Fire Protection, 2018
City Planning Areas

A city boundary not regulated by the county Local Agency Formation Commission. For a city, the planning area boundary typically coincides with the sphere of influence that encompasses land both within the city limits and potentially annexable land.

Source: Greenbelt Alliance Last updated May 24, 2019
Climate Water Deficit

Climatic water deficit (CWD) quantifies evaporative demand exceeding available soil moisture, where S = soil moisture, AET = actual evapotranspiration, D =climatic water deficit.

Source: USGS-BCM (Flint and Flint) Minimum Acreage Threshold: 100.0 acres Last updated May 24, 2019
CNDDB Rare and Protected Species

The California Natural Diversity Database (CNDDB) is a geographic and tabular inventory of the status and locations of rare plants and animals in California and is maintained by the biogeographic data branch of the California Department of Fish and Wildlife. CNDDB staff work with partners to maintain current lists of rare species and maintain an ever-growing database of GIS-mapped locations for these species. Species occurrence records in the CNDDB come from a variety of sources with differing accuracies. For the Greenprint, we filtered the records in order to report only recent records with a high degree of confidence in spatial accuracy. The table below shows table values used to filter records.

Minimum Acreage Threshold: 20.0 acres Last updated May 24, 2019
Coastal Resilience

The ability of a particular coastal area and its communities to recover from flooding from extreme weather events. Climate change is predicted to have significant adverse effects on coastal zones due to the dangerous combination of storm surge, downstream flooding, and sea level rise. In the Greenprint, coastal resilience focuses on nature's role in reducing coastal flood risk. Natural coastal habitats, such as wetlands, act to disperse storm energy and temporarily store flood water, which can reduce the level of vulnerability of coastal communities.

Source: USGS/Our Coast Our Future; NOAA CCAP Last updated May 24, 2019
Coastal Zone policy

The area under regulatory control by coastal management agencies with jurisdiction over all federal activities and federally licensed activities that affect coastal resources.

Source: Greenbelt Alliance, 2017 Last updated May 24, 2019
Communities of Concern

A Community of Concern in the Bay Area is defined as a neighborhood that contains predominantly low-income and minority households, or that carries a burden of social disadvantages. This layer uses MTC Communities of Concern (2018) with American Community Survey Data (2012-2016).

Source: MTC Last updated May 24, 2019
Community Resources and Potential Hazards Plan

Jurisdiction: Gilroy. Protection: Requires development along Uvas Creek and the main branch of Llagas Creek to be set back either the entire area of the floodway or 250 feet on either side of the creek centerline, whichever is greater. 

Source: City of Gilroy General Plan Last updated May 24, 2019
Community Separators

Jurisdiction: Sonoma County Protection: Community Separators are rural open space and agricultural and resource lands that separate cities and other communities, prevent sprawl, protect natural resources, and provide city and community identity by providing visual relief from continuous urbanization. Community Separators enhance the identities of individual cities and communities. The policy preserves the visual identities of communities by maintaining these open space areas between cities and communities.

Source: Sonoma County General Plan 2020 Last updated May 28, 2019
Concord Reuse Project: Conservation Open Space

Jurisdiction: Concord. Protection: The reuse of the Inland Area of the Concord Naval Weapons Station (CNWS) represents a significant opportunity for Concord and for the region to grow and provide long-lasting benefits. The City led an open and transparent planning process with the local and regional community from 2006-2012, culminating in the Concord Reuse Project Area Plan, which will result in a world class, transit-oriented project. The Concord Reuse Project site will have portions of its land that are considered open space and thus should be protected accordingly.

Source: City of Concord Community Reuse Project Last updated May 28, 2019
Conservancy Fairy Shrimp

Jurisdiction: U.S. Fish & Wildlife Service, Alameda County, Contra Costa County. Protection: When a species is proposed for listing as endangered or threatened under the Endangered Species Act, the U.S. Fish and Wildlife Service (Service) must consider whether there are areas of habitat believed to be essential to the species' conservation. Critical habitat for this species was designated in 2006. 

Source: U.S. Fish & Wildlife Service Last updated May 28, 2019
Conservation Action (RIP-8)

Jurisdiction: Alameda County. Protection: The East Alameda County Conservation Strategy (EACCS) seeks to preserve endangered species through habitat protection. In 2010, EACCS assessed areas all across East Alameda County for their conservation value and established guiding biological principles for conducting conservation in the county. Part of that guidance includes working with willing landowners to implement long-term conservation stewardship that would offset impacts from local land use, transportation or other infrastructure projects.

Source: East Alameda County Conservation Strategy Last updated May 28, 2019
Conservation, Design, and Open Space Plan (Policy CDO 7-1)

Jurisdiction: Cloverdale. Protection: A set of policies to conserve and protect the area's natural vegetation. For example, Policy CDO 7-1.a amended the Zoning Ordinance to provide 100 foot buffers (50 feet on each side) from creeks and rivers shown on the City's Conservation Elements Map. Where the Russian River buffer is wider than 50 feet on the map, provide the wider buffers.

 

 

 

onservation Element Map. Where the Russian River buffer is wider than 50 feet on the map, provide the wider buffers.

Source: City of Cloverdale General Plan Last updated May 28, 2019
Conservation easement

A voluntary legal agreement between a landowner and a land trust or government agency that permanently limits uses of the land in order to protect its conservation values. The conservation easements in the Greenprint were obtained from the Bay Area Protected Areas Database (BPAD), a regional inventory of lands that have been permanently protected from development. Lands protected under easements are generally not accessible to the public. For more information about protected lands and the BPAD, visit www.bayarealands.org.

Source: Bay Area Protected Areas Database, version CCEd 2014a, 2014 Last updated May 28, 2019
Conservation Element Plan (Policy 1.3, 2.7, 3.1)

Jurisdiction: Los Altos Hills. Protection: Protect and maintain those areas necessary to the integrity of natural resources and processes, with special emphasis on, but not limited to, the groundwater recharge and drainage system, open spaces vital for wildlife habitat, open spaces suitable for  agriculture, and other areas of major or unique ecological significance. Open space easements may be required by the Town as a condition of approval for site development. When an easement is required, the property owner signs an agreement with the Town to keep the easement undeveloped and in its  natural condition.

Source: Town of Los Altos Hills General Plan Last updated May 28, 2019
Conservation Lands Network

The Conservation Lands Network (CLN) is the make-up of the types, amount and distribution of habitats that comprise the most essential lands needed to sustain the biodiversity of the San Francisco Bay Area. Many factors were considered in the development of the CLN, including the conservation targets (coarse and fine filter), goals for those targets, land use, proximity to existing protected lands, and conservation suitability (ecological integrity) of the landscape, in addition to the expert opinion of a focus team scientists. The CLN is complemented by the Bay Area Critical Linkages, which consists of lands that are important for movement of particular focal species such as mountain lion, badger, and deer.

Source: Bay Area Open Space Council, Conservation Lands Network Last updated May 28, 2019
Conservation Plan (Policy 8-89)

Jurisdiction: Contra Costa County. Protection:  Setback areas shall be provided along natural creeks and streams in areas planned for urbanization. The setback areas shall be of a width adequate to allow maintenance and to prevent damage to adjacent structures, the natural channel and associated riparian vegetation. The setback area shall be a minimum of 100 feet; 50 feet on each side of the centerline of the creek. 

Source: Contra Costa County General Plan Last updated May 28, 2019
Conservation Plan (Policy CON-14, CON-28)

Jurisdiction: Napa County Protection: Includes: CON-14:To offset possible losses of fishery and riparian habitat due to discretionary development projects, developers shall be responsible for mitigation when avoidance of impacts is determined to be infeasible. Such mitigation measures may include providing and permanently maintaining similar quality and quantity habitat within Napa County, enhancing existing riparian habitat, or paying in-kind funds to an approved fishery and riparian habitat improvement and acquisition fund. Replacement habitat may occur either on-site or at approved off-site locations, but preference shall be given to on-site replacement; and CON-28: To offset possible additional losses of riparian woodland due to discretionary development  projects and conversions, developers shall provide and maintain similar quality and quantity of replacement habitat or in-kind funds to an approved riparian woodland habitat improvement and acquisition fund in Napa County. While on-site replacement is preferred where feasible, replacement habitat may be either on-site or off-site as approved by the County. 

 

Source: Napa County General Plan Last updated May 28, 2019
Contra Costa Goldfields

Jurisdiction: U.S. Fish & Wildlife Service, Alameda County, Contra Costa County. Protection: When a species is proposed for listing as endangered or threatened under the Endangered Species Act, the U.S. Fish and Wildlife Service (Service) must consider whether there are areas of habitat believed to be essential to the species' conservation. Critical habitat for this species was designated in 2006. 

Source: U.S. Fish & Wildlife Service Last updated May 28, 2019
Contra Costa Wallflower

Jurisdiction: U.S. Fish & Wildlife Service, Alameda County, Contra Costa County. Protection: This species is listed as endangered by the U.S. Fish & Wildlife Service.

Source: U.S. Fish & Wildlife Service Last updated May 28, 2019
Cooperative Planning Area for Agriculture and Open Space

Jurisdiction: Solano County. Protection: The Tri-City and County Cooperative Plan for Agriculture and Open Space Preservation was adopted by Solano County and the cities of Vallejo, Benicia, and Fairfield in 1994 as part of each jurisdiction’s general plan. The plan is intended to guide future land use and park planning for the protection of open space and agricultural resources in an area located south of SR 12 and west of I-680. 

Source: Solano County General Plan Last updated May 28, 2019
County Line

The administrative division of a region which coordinates certain government functions, including law enforcement, through court systems and sheriff's departments, transportation plans, and other services.

Source: County Boundaries, California Department of Forestry and Fire Protection Last updated May 28, 2019
County Zoning

The zoning designations combined from the eight counties of the Bay Area without San Francisco. This information includes general and specific zoning codes, with text descriptions copied from the original county map files online in 2016.

Source: At Risk 2017 Last updated Aug. 1, 2016
Creek and Drainageway Setbacks (CON-6)

Jurisdiction: San Rafael. Protection: Adequate setback for a structure from a drainageway shall be determined at the time of project review. Setbacks should include a twenty-five foot (25′) or greater setback between any structure and the high top of the creek bank.

Source: City of San Rafael Zoning Code Last updated May 28, 2019
Critical habitat policy

The US Fish & Wildlife Service is required by the Federal Endangered Species Act to identify areas (critical habitat units) considered essential for the conservation of a threatened or endangered species that may require special management and protection.

Source: U.S. Fish & Wildlife Service Last updated May 28, 2019
Critical habitat streams policy

The waterways and waterbodies identified as essential for the conservation of a threatened or endangered species under the Federal Endangered Species Act that may require special management and protection.

Source: Greenbelt Alliance Last updated May 28, 2019
Crop production

The average dollar value of crops produced for each agricultural type. USDepartment of Agriculture (USDA) and California Department of Forestry and Fire Protection's CALFIRE Fire and Resource Assessment Program (FRAP), in cooperation with California Department of Fish and Wildlife VegCamp program and extensive use of USDA Forest Service Region 5 Remote Sensing Laboratory (RSL) data, has compiled the "best available" land cover data available for California into a single comprehensive statewide data set.

Source: USDA et al Last updated May 28, 2019
Davis-Dixon Greenbelt

Jurisdiction: Dixon, Davis, Solano Land Trust, federal and state agencies. Protection: The Agricultural Reserve Overlay indicates an area in which the County encourages private landowners to voluntarily participate in agricultural conservation easements. This overlay incorporates existing agricultural conservation easements and established new land easement acquisition methods (such as TDRs) that encourage landowner cooperation, with the goal of permanently protecting the prime farmlands and scenic resources of the area located between the two cities.

Source: Solano County General Plan Last updated May 28, 2019
Delta Green Ground Beetle

Jurisdiction: U.S. Fish & Wildlife Service, Alameda County, Contra Costa County. Protection: When a species is proposed for listing as endangered or threatened under the Endangered Species Act, the U.S. Fish and Wildlife Service (Service) must consider whether there are areas of habitat believed to be essential to the species' conservation. This species has been listed as threatened. Critical habitat for this species was designated in 1980.

Source: U.S. Fish & Wildlife Service Last updated May 28, 2019
Delta Primary Zone

Jurisdiction: Delta Protection Commission. Protection: The Delta Protection Act of 1992 established the Delta Protection Commission, a State entity to plan for and guide the conservation and enhancement of the natural resources of the Sacramento-San Joaquin Delta, while sustaining agriculture and meeting increased recreational demand. The Act defines a Primary Zone, which comprises the principal jurisdiction of the Delta Protection Commission. The Primary Zone of the Delta includes approximately 500,000 acres of waterways, levees and farmed lands extending over portions of five counties: Solano, Yolo, Sacramento, San Joaquin and Contra Costa. The Secondary Zone is the area outside the Primary Zone and within the “Legal Delta”; the Secondary Zone is not within the planning area of the Delta Protection Commission. 

Source: Delta Protection Commission, Land Use and Resource Management Plan for the Primary Zone of the Delta Last updated June 10, 2019
Delta Smelt

Jurisdiction: U.S. Fish & Wildlife Service, Alameda County, Contra Costa County Protection: When a species is proposed for listing as endangered or threatened under the Endangered Species Act, the U.S. Fish and Wildlife Service (Service) must consider whether there are areas of habitat believed to be essential to the species' conservation. Delta Smelt was listed as threatened under the Federal Endangered Species Act and the California Endangered Species Act (CESA) in 1993. In 2009, CESA status was changed to endangered. USFWS designated critical habitat for this species in 1994.

Source: California Department of Fish & Wildlife Last updated May 28, 2019
Development Clustering (Policy 8)

Jurisdiction: Union City. Protection: Development clusters shall be encouraged in the Hillside Area. Development clusters shall be surrounded by major open space, and shall be visually unobtrusive and harmonious with the natural environment.

Source: City of Union City General Plan (Hillside Area Plan) Last updated May 28, 2019
Development on Steep Slopes (Policy R-GD 29)

Jurisdiction: Santa Clara County. Protection: Development initiatives on areas greater than 30 percent slope shall be thoroughly evaluated before approval in accordance with all existing regulations. In addition, a public hearing shall be required and notice should be provided to residents within 300 feet of the subject property.

Source: Santa Clara County General Plan Last updated June 6, 2019
Development Restriction on Class I or II Ridgeline (Ordinance 6-2023)

Jurisdiction: Lafayette. Protection: Imposes development restrictions along major ridgelines, which are to be preserved in their natural state as natural resource and wildlife corridors. A setback of 400 feet for a Class I ridgeline and a setback of 250 feet for a Class II ridgeline should be implemented.

Source: City of Lafayette Municipal Ordinance Last updated May 28, 2019
Disadvantaged Communities

A Disadvantaged Community is defined by the state of California as a neighborhood burdened by pollution and vulnerable to the adverse effects of pollution. Disadvantaged communities are defined as the top 25% scoring areas from CalEnviroScreen along with other areas with high amounts of pollution and low populations.

Source: CA Office of Environmental Health Hazard Assessment Last updated May 28, 2019
Displacement Typologies

Urban investment in low-income communities and communities of color may fail to equitably distribute benefits to existing residents, leading to neighborhood gentrification and displacement of low-income and/or minority residents. The Urban Displacement Project at the University of California-Berkeley identifies three different displacement typologies: low-income communities at risk of gentrification and/or displacement; low-income communities experiencing ongoing gentrification and/or displacement; and moderate- to high-income communities in advanced gentrification.

Source: Zuk, M., & Chapple, K. (2015). Urban Displacement Project. Last updated May 28, 2019
Dublin Open Space Initiative 2014

Jurisdiction: Dublin. Protection: Preserves both the Doolan Canyon area to the East of the city and the area to the West of the city as agricultural or open space land and prevents any residential or commercial development. The measure, approved directly by the City Council in 2014, removed authority from the city council to control the property, preventing any development without approval from voters.

Source: Dublin General Plan Last updated May 28, 2019
East Contra Costa County (NCCP/HCP)

Jurisdiction: Brentwood, Clayton, Oakley and Pittsburg, Contra Costa County, Contra Costa County Flood Control and Water Conservation District and East Bay Regional Park District. Protection: The East Contra Costa County HCP/NCCP is intended to provide regional conservation and development guidelines to protect natural resources while improving and streamlining the permit process for endangered species and wetland regulations.

Source: East Contra Costa County Habitat Conservancy Last updated May 30, 2019
Ecology of Creeks and Streams (Policy 1)

Jurisdiction: Novato. Protection: Section 19.35 of the Novato Zoning Ordinance establishes buffer areas along watercourses to protect water quality, minimize flood hazards and maintain or expand storage capacity for flood waters. Section 19.35 establishes a “stream protection zone” that includes the stream bed, the stream banks, all riparian vegetation and a buffer zone at least 50 feet wide, measured from the top of the channel bank. The stream protection zone may be expanded or reduced based on specific site conditions. Any proposed development, grading, fill, planting, or vegetation removal requires a use permit. In order to obtain a use permit, an applicant must submit a Stream Management Plan and incorporate annual maintenance requirements into the project.

Source: City of Novato Zoning Ordinance Last updated May 30, 2019
Emissions from Soil Disturbance

The emissions from soil disturbance assume that 30% of the carbon stored in soils will be emitted. The emissions estimates do not account for current land uses (i.e. current agricultural tilling), and therefore may be an overestimate of actual carbon emissions. 

 

Source: EPA equivalencies calculator Last updated May 30, 2019
Environmental Management Plan (Policy EM-2.5)

Jurisdiction: San Carlos. Protection: All new development shall be set back a minimum 25 feet from the top of bank line or such other distance as specified by the Planning Commission. Promotes the establishment of native vegetation and the removal of nonnative invasive plants in riparian areas.

Source: San Carlos General Plan Last updated May 30, 2019
Environmental Protection: Slope Regulations (Ordinance 19.08.040)

Jurisdiction: Calistoga. Protection: No construction, grading or vegetation removal may occur in areas with a slope of 30 percent or greater, unless an exemption is granted. Permitted projects are subject to restrictions and design reviews related to their location.

Source: Calistoga Municipal Code Last updated May 30, 2019
Erosion and Siltation Control (Implementing Policy 3)

Jurisdiction: Dublin. Protection:  Require erosion control plans for proposed development. Restrict areas of steep slopes (more than 30%) to permanent open space, as part of an overall cluster development concept on approved plans. Any development in otherwise restricted areas shall require substantial mitigation which has considerable benefit to the community, in keeping with the standards of Dublin General Plan Policy 3.2.2.A.1.

Source: City of Dublin General Plan Last updated May 30, 2019
Exposure

The risk of vegetation becoming highly stressed by climate change, because the vegetation in those areas will likely experience climate conditions that are only marginally suitable or unsuitable. The use of the vegetation community maps provided in the California Climate Vulnerability Assessment permits examination of the rates of transition from climatically suitable to climatically stressed extents for each vegetation type.

Source: Data based on methods from 'California Climate Vulnerability Assessment of Macrogroup Vegetation' Last updated May 30, 2019
Fallow cropland

Land previously cultivated that remains unplanted, or “fallow”, for one or more seasons because farmers are unable to fully irrigate crops.

Source: Central Valley Fallowing Data Report Minimum Acreage Threshold: 100.0 acres Last updated May 30, 2019
Farmland of Local Importance

Land of importance to the local agricultural economy as determined by each county's board of supervisors and a local advisory committees.

Source: Farmland Mapping and Monitoring Program, 2016 Minimum Acreage Threshold: 10.0 acres Last updated May 30, 2019
Farmland of Statewide Importance

Farmland that is otherwise similar to Prime Farmland but with minor shortcomings, such as greater slopes or less ability to store soil moisture. Land must have been used for irrigated agricultural production in the last four years.

Source: Farmland Mapping and Monitoring Program, 2016 Minimum Acreage Threshold: 10.0 acres Last updated May 30, 2019
Fire Hazard Severity Zone

This mapping effort intends to create more accurate fire hazard zone designations that support fire mitigation strategies in areas where potential hazards warrant these investments. The fire hazard zones provide specific designation for application of defensible space and building standards consistent with known mechanisms of fire risk to people, property, and natural resources.

Source: CalFire, 2014 Last updated May 30, 2019
Fish passage priority barrier

Human-made barriers to salmonid migration, including road-stream crossings, irrigation diversions, and dams, that have been deemed priorities for removal by the California Department of Fish and Wildlife based on significance to fish migration. Migration passage impediments and delays affect both adult and juvenile fish. Given the magnitude and severity of barriers and the decline of salmonid populations, reconnecting isolated stream habitat is an important priority for the restoration of impaired anadromous salmon and steelhead stocks. The Passage Assessment Database (PAD) is an ongoing map-based inventory of known and potential barriers to anadromous fish in California, compiled and maintained through a cooperative interagency agreement.

Source: CalFish Last updated May 30, 2019
Fish passage total barrier

The Passage Assessment Database (PAD) is an ongoing map-based inventory of known and potential barriers to anadromous fish in California, compiled and maintained through a cooperative interagency agreement. Total barriers to salmonid migration include some road-stream crossings and dams.

Source: CalFish, 2019 Last updated May 30, 2019
Franciscan Manzanita

Jurisdiction: U.S. Fish & Wildlife Service, Alameda County, Contra Costa County. Protection: When a species is proposed for listing as endangered or threatened under the Endangered Species Act, the U.S. Fish and Wildlife Service (Service) must consider whether there are areas of habitat believed to be essential to the species' conservation. USFWS designated critical habitat for this endangered species in 2013.

Source: U.S. Fish & Wildlife Service Last updated May 30, 2019
Franklin Canyon (Measure M)

Jurisdiction: Hercules. Protection:  Franklin Canyon is a 483-acre parcel of open space/agricultural land which forms the northeastern most parcel of land within the City of Hercules in Contra Costa County. Adopted in 2010, the purpose of this ordinance is to protect Franklin Canyon and nearby open space lands from harmful and unnecessary development by designating the land for agricultural and limited residential use (minimum parcel size of 40 acres).

Source: City of Hercules Measure M Last updated May 30, 2019
General Conservation Policies

Policies that provide limited protection to a range of natural and agricultural values. They include rural growth measures and open space reserves that are set aside permanently or temporarily by a single jurisdiction or by several jurisdictions.

Source: Greenbelt Alliance Last updated May 30, 2019
General Plan Book B (O-25, R-RC 31, 32, 37, 38)

Jurisdiction: Santa Clara County. Protection: A series of policies whose goals are to: preserve natural streams, riparian areas, and freshwater marshes by protecting them from pollution, development impact, hazardous chemicals; adopt tree removal regulations; and protect endemic and endangered species.For example, R-RC 37 provides that lands near creeks, streams, and freshwater marshes shall be considered to be in a protected buffer area, consisting of 150 feet from the top bank on both sides where the creek or stream is predominantly in its natural state, or 100 feet from the top bank on both sides of the waterway where the creek or stream has had major alterations.

Source: County of Santa Clara General Plan, Book B Last updated May 30, 2019
General Plan: Open Space Protection

Jurisdiction: Walnut Creek. Protection: The development of land with slopes of 20 percent or greater or within 75 vertical feet of any ridgeline is prohibited.

Source: Walnut Creek Hillside/Open Space Protection Ordinance Last updated May 30, 2019
Geographical Pressures

Undeveloped locations where it is easier to build new development, including parcels adjacent to existing and recent development as well as major roads, and low sloped lands.

Last updated May 30, 2019
Grazing land

The land on which existing vegetation is suited to the grazing of livestock.

Source: Farmland Mapping and Monitoring Program Minimum Acreage Threshold: 10.0 acres Last updated May 30, 2019
Groundwater Recharge

Water that penetrates below the root zone, infiltrating soils and potentially replenishing aquifers.

Source: USGS-BCM (Flint and Flint) Minimum Acreage Threshold: 633.0 acres Last updated May 30, 2019
Growth Projections - Plan Bay Area, Statewide

Plan Bay Area 2040 is an updated long-range Regional Transportation Plan and Sustainable Communities Strategy for the nine-county San Francisco Bay Area. In early 2016, ABAG and MTC developed and evaluated three land use and transportation scenarios as part of the update of Plan Bay Area 2040, the region’s long-range transportation and housing plan. Planners at MTC and ABAG have generated regional forecasts for: (1) Jobs: what will the economy look like and where will new jobs be? (2) Housing: where will new housing be developed and who will live there? (3)opulation: how will our region grow? (4) Travel Needs: where will people need to go and how will they get there? (5) Funding for Transportation Improvements: what funds will be available from gas taxes, sales taxes, bridge tolls and the like? 

The three scenarios depicted a different combination of: Housing Development, Commercial Growth and Transportation Investments.

Source: Plan Bay Area 2040 Last updated May 30, 2019
Habitat policy

Areas identified as important for protection and conservation in jurisdictional plans and in the Bay Area's Habitat Conservation Plans.

Source: Greenbelt Alliance Last updated May 31, 2019
Health and Safety Element (Policy HS 2.4)

Jurisdiction: Fairfield. Protection: General Plan policy states that development is discouraged on slopes in excess of twenty (20) percent and/or unstable soils. In November 2016, voters approved Measure T, which amends the Fairfield General Plan to allow a land preserve and open space conservation area at I-680 and Golden Hill Road.

Source: City of Fairfield General Plan Last updated May 31, 2019
Hill Area Open Space

Jurisdiction: Fremont. Protection: Seven open space designations and one public facility designation appear on the City General Plan land use map. The Hill Area Open Space designation applies to most of the open lands defined by voter-approved Measure A (Hillside Initiative of 1981) and Measure T (Hill Area Initiative of 2002). This designation includes two sub-areas, and a total of three designations. 

Source: City of Fremont General Plan Last updated May 31, 2019
Hill Face Open Space (Measure T)

Jurisdiction: Fremont. Protection: Measure T applies to Fremont’s eastern Hill Area and includes all land above the toe of the hill (TOH, the line along the base of the hills where the natural grade first becomes 20 % or more), extending south and east to Alameda Creek and Calaveras Creek. Measure T permits only very low densities of one unit per 20 acres for existing parcels.

Source: City of Fremont General Plan Last updated May 31, 2019
Hillside and Rural Preservation (Policy LU-17.6)

Jurisdiction: San Jose. Protection: Avoid any new development along ridges and other major hillside areas (typically all properties that exceed 30% slope) that surround the valley floor to minimize visibility of development on these aesthetic resources. 

Source: City of San Jose General Plan Last updated May 31, 2019
Hillside Combining District: Building Restriction (Ordinance 18.44.030)

Jurisdiction: Morgan Hill. Protection: Buildings, private streets, and driveways may not be constructed on slopes greater than 20 percent except when the review authority finds that the proposed encroachment will not conflict with the purpose and intent of the H combining district. 

Source: City of Morgan Hill Zoning Code Last updated May 31, 2019
Hillside, Creek, and Ridgeline Development Standards : Ridgeline Setback

Jurisdiction: San Ramon. Protection:  No structure shall be located within 100 feet, measured vertically, of the centerline of a major ridge, or within 50 feet, measured vertically, of the centerline of a minor ridge. Where structures are proposed within 1,000 feet of a major ridge as identified in General Plan, the building pad shall be graded and the building designed so that the structure maintains a low-profile appearance and conforms to the natural grade of the hillside, as determined by the review authority.

Source: City of San Ramon Zoning Ordinance Last updated May 31, 2019
Hillside Development (Policy 2)

Jurisdiction: Vallejo. Protection: Hillside projects in Planned Development areas in which buildings are proposed on average natural slopes in excess of 10% shall be carefully evaluated to insure the enhancement and preservation of the natural topography and character of the hillsides.

Source: City of Vallejo General Plan Last updated May 31, 2019
Hillside Development (Policy LU-7.1, 7.2)

Jurisdiction: Hayward. Protection: Policy LU-7.1 prohibits the construction of buildings on unstable and steep slopes (slopes greater than 25 percent). Policy LU-7.2 discourages the placement of homes and structures near ridgelines to maintain natural open space and preserve views. If ridgeline development cannot be avoided, the City shall require grading, building, and landscaping designs that mitigate visual impacts and blend the development with the natural features of the hillside.

Source: City of Hayward General Plan Last updated May 31, 2019
Hillside Open Space (Measure A)

Jurisdiction: Fremont. Protection: Measure A prevents development from exceeding one unit per acre or one unit per four acres for constrained lands.

Source: City of Fremont General Plan Last updated May 31, 2019
Hillside policy

Hillside areas identified as important for protection or to minimize landslide threat based upon the physical descriptions in city and county general plans. Policies assess the slope of a hill, the area of a hill above a certain elevation, and the area within a certain vertical or horizontal distance from a ridgeline.

Source: Greenbelt Alliance Last updated May 31, 2019
Hillside Project Development Standards (Ordinance 19.26.050)

Jurisdiction: Novato. Protection: No development potential shall be allowed for areas with average slopes of greater than 25 percent.

Source: City of Novata Municipal Code Last updated May 31, 2019
Hillside Protection (Policy 9-P-6)

Jurisdiction: Pittsburg. Protection: Building pads and structural elements shall be located at least 150 feet away, horizontally, from the crest of a major ridgeline.

Source: City of Pittsburg General Plan Last updated May 31, 2019
Historical extent of Bay

The extent of San Francisco and San Pablo bays as they likely appeared about 200 years ago, when Europeans first arrived in the region. Learn more about the baylands at www.sfei.org/ecoatlas.

Source: San Francisco Estuary Institute Last updated May 31, 2019
Historic Wildfires

The data provides a comprehensive view of the distribution of past large fires going back to 1950.

Source: CalFire Last updated May 31, 2019
Hotspots of species requiring compensatory mitigation

Cumulative hectares of suitable habitat in a 25-hectare region for species that may be impacted by proposed transportation projects in the next two decades. These species have some regulatory protective status that requires compensatory action to mitigate development impacts.

Source: Bay Area Conservation Mitigation Assessment Huber et al. 2016 Minimum Acreage Threshold: 100.0 acres Last updated May 31, 2019
Hydrogeologically Vulnerable areas

Areas over aquifers where soil or rock conditions enable higher rates of recharge and therefore make the aquifer more vulnerable (or susceptible) to surface contaminants.

Source: State Water Board Last updated May 31, 2019
Impaired waterbodies - 303d listed waterbodies

Section 303(d) of the Federal Clean Water Act gives states the responsibility of preparing a list of surface waters (e.g., water bodies and streams) not meeting water quality standards due to pollutants. To comply with 303(d), State and Regional Water Boards assess water quality monitoring data for California's surface waters every two years to determine if they contain pollutants at levels that exceed protective water quality standards. Water bodies and pollutants that exceed protective water quality standards are considered "impaired" and are placed on the State's 303(d) list.

Source: Environmental Protection Agency Last updated May 31, 2019
Impaired waterways - 303d listed streams

Section 303(d) of the Federal Clean Water Act gives states the responsibility of preparing a list of surface waters (e.g., water bodies and streams) not meeting water quality standards due to pollutants. To comply with 303(d), State and Regional Water Boards assess water quality monitoring data for California’s surface waters every two years to determine if they contain pollutants at levels that exceed protective water quality standards. Water bodies and pollutants that exceed protective water quality standards are considered "impaired" and are placed on the State's 303(d) list.

Source: Environmental Protection Agency Last updated May 31, 2019
Important habitat for T&E Vertebrates

An index of the habitat value to species listed as threatened and endangered under the Endangered Species Act, including birds, mammals, reptiles, and amphibians. The index combines threatened and endangered species richness (measured by the overlap of species ranges) and the suitability of the vegetation to support each of those species.

Source: Custom TNC product (not available for download) Minimum Acreage Threshold: 100.0 acres Last updated May 31, 2019
Irrigation Capability Class

Preserving prime agricultural lands and open space is a key statutory mandate of California's Local Agency Formation Commissions (Cortese-Knox Hertzberg Act 2000, Gov. Code §56301). Irrigation capability is a soil characteristic that classifies potential agricultural lands by the suitability of soils for most kinds of field crops. The soils are grouped according to their limitations for field crops, the risk of damage if they are used for crops, and the way they respond to management. Class I and II lands are statutorily defined as prime agricultural land.

Source: USDA - Soil Survey Geographic Database Last updated June 5, 2019
Key Riparian Corridor

Riparian corridors that were prioritized for conservation, specifically focusing on native species found in San Francisco bay, as part of the Conservation Lands Network (CLN) database.

Source: Bay Area Open Space Council, Conservation Lands Network Minimum Acreage Threshold: 10.6 acres Last updated May 31, 2019
Landscape refugia

Areas where vegetation will not likely be stressed by climate change because the vegetation in those areas will likely experience climate conditions that are within the range of conditions they are currently found in in California.

Source: A Climate Change Vulnerability Assessment of California's Terrestrial Vegetation Minimum Acreage Threshold: 100.0 acres Last updated May 31, 2019
Landscape Resilience - resilient areas

An index that indicates the presence and accessibility of microhabitat options by quantifying both the permeability of the landscape and the diversity in potential "wetness" and "heat" based on topography.

Source: Custom TNC product (not available for download) Minimum Acreage Threshold: 100.0 acres Last updated May 31, 2019
Land Use Element (Policy LU 3-2, Implementation LU 3-2.A)

Jurisdiction: Cloverdale. Protection: On hillside sites, any development, grading for roadways, and lighting, including building lighting, shall not be visible from the level areas of the city below the 400-foot elevation. Where a hillside site has land with slopes over 20 percent and slopes less than 20 percent, development should be placed on lands less than 20 percent if feasible. Remaining hillside areas (with slopes over 20 percent) shall be deemed undevelopable areas and made subject to easements or other legal guarantees that prohibit development of the hillsides and cannot be removed without city approval.

 

Source: City of Cloverdale Municipal Code Last updated May 31, 2019
Linkage highway barrier

Highways and other major roads can bisect otherwise intact habitat linkages, creating barriers to wildlife movement. The Bay Area Open Space Council prepared a geographic database of such highway barriers throughout the Bay Area via visual analysis of aerial photography, and maps of vegetation and habitat linkages.

Source: Bay Area Open Space Council, Conservation Lands Network Last updated May 31, 2019
Liquefaction Susceptibility

This map shows recent unconsolidated sediments and the corresponding liquefaction susceptibility for the urban core of the San Francisco Bay region.

Source: USGS Last updated May 31, 2019
Local Coastal Program (LCP)

Jurisdiction: San Mateo County. Protection: Prohibit development on slopes of 30% or more, unless (1) no alternative exists or (2) the only practicable alternative site is on a skyline or ridgeline. Parcels shall not be created where the only building site, in whole or in part, including roads and driveways, is on a slope of 30% or more. 

Source: County of San Mateo, Local Coastal Program Policies Last updated May 31, 2019
Longhorn Fairy Shrimp

Jurisdiction: U.S. Fish & Wildlife Service, Alameda County, Contra Costa County Protection: This species has been listed as endangered under the federal Endangered Species Act.  USFWS designated critical habitat for the species in 2006.

Source: U.S. Fish & Wildlife Service Last updated May 31, 2019
Marbled Murrelet

Jurisdiction: U.S. Fish & Wildlife Service, Alameda County, Contra Costa County. Protection: This species is Federally listed under the Endangered Species Act as a threatened species in Washington, Oregon and California, and State-listed as endangered in California and as threatened in Oregon and Washington. USFWS designated critical habitat for the species in 2011.

Source: U.S. Fish & Wildlife Service Last updated May 31, 2019
Market Activity - Current Projects

Development proposals and approved projects in a city or county entitlement process that lie outside of San Francisco Bay Area's contiguous urbanized lands. This also includes lands under speculative pressure, though no official planning proposal has been submitted to a jurisdiction's planning department. This includes projects and boundary expansions proposed in the last five years on open space but that have since been rescinded from the entitlement and planning process.

Source: Greenbelt Alliance Last updated May 31, 2019
Measure C Agricultural Core

Jurisdiction: Contra Costa County. Protection: This designation applies to agricultural lands that are composed primarily of prime (Class I or II) soils in the Soil Conservation Service Land Use Capability Classifications, which are considered the very best soils for farming a wide variety of crops. This land is designated to preserve and protect economically viable agricultural units while discouraging "ranchette" housing development.

Source: Contra Costa County General Plan Last updated May 31, 2019
Measure P

Jurisdiction: Napa County. Protection: Measure P extends the provisions of Measure J, the Agricultural Lands Preservation Initiative, which voters passed in 1990 to 2058. Specifically it continues to require voter approval for land designation changes in agricultural and watershed areas.

Source: Napa County General Plan Last updated May 31, 2019
Measure P Agricultural Lands Preservation Initiative

Jurisdiction: Napa County. Protection: Provisions governing the intent and maximum building intensity for lands designated Agriculture, Watershed and Open Space and Agricultural Resourcemay not be amended or deleted without subsequent voter approval until after December 31, 2058, or after a later date if an extension is approved by the voters. 

Source: Napa County General Plan Last updated May 31, 2019
Measure T Orderly Growth Initiative

Jurisdiction: Solano County. Protection: The County's 1994 Orderly Growth Initiative directed residential growth into the county's seven cities, rather than the unincorporated areas. Lands zoned for agriculture cannot change without a popular vote thereby supporting the County's economy and quality of life. Measure T was an amendment that preserved and updated the Orderly Growth Initiative; it was approved by voters in 2008. This measure readopted the Orderly Growth Initiative’s policies that strictly limit the Board of Supervisor’s ability to change the designation of “Agriculture” or “Open Space” lands through the year 2028 and updated the Orderly Growth Initiative’s density standards for development of “Agriculture” or “Open Space” lands and extend the effect of those density standards through the year 2028.

Source: Solano County Ordinance 2008-01 Last updated May 31, 2019
Metric Acreage Threshold

Some metrics reported by the GreenPrint application will be less accurate when measured over smaller areas. This is often a function of the dataset resolution as well as natural variation in the real-world conditions. When the reported area is below a certain acreage, some metrics may be suppressed so as not to give misleading results and/or the metric value may be supplemented with warnings. Metrics in this glossary will note minimum acreage thresholds where they apply.

Last updated May 31, 2019
Morgan Hill Greenbelt

Jurisdiction: Morgan Hill. Protection: Policies seek to establish a greenbelt around the City, which is intended to physically define the City and separate it from San Jose and San Martin. The goal is to preserve El Toro Mountain, conserve resources and protect the City’s cultural heritage to help Morgan Hill retain its rural atmosphere as it continues to grow. The Greenbelt includes areas with steep hillsides, severe geologic/environmental constraints, open space, & areas located on the fringe of the community, and does not include unincorporated areas.

Source: City of Morgan Hill General Plan Last updated May 31, 2019
Municipal drinking water supply watersheds

Watersheds that supply water to a water utility.

Source: The Nature Conservancy Minimum Acreage Threshold: 100.0 acres Last updated May 31, 2019
Natural and Historic/Cultural Resources (Policy P8.3.2)

Jurisdiction: American Canyon. Protection: Where riparian corridors are retained, they shall be protected by an adequate buffer with a minimum 100 foot protection zone from the edge of the tree, shrub, or herb canopy. Prohibits developments that alter the biological integrity of Riparian Corridors, unless no feasible alternative exists or the damaged habitat is replaced with a habitat of equivalent value.

Source: American Canyon General Plan Last updated June 3, 2019
Natural Baylands

The many types of tidally-influenced natural habitats, such as mudflats and marshes, that are found at the interface of uplands and the Bay estuary. See further land-cover definitions at https://coast.noaa.gov/digitalcoast/training/ccap-land-cover-classifications.html

Source: NOAA Coastal Change Analysis Program Minimum Acreage Threshold: 100.0 acres Last updated June 3, 2019
Natural Hazards (Policy 10-P-1 B)

Jurisdiction: Petaluma. Protection: On sites with slopes greater than 30 percent, require all development to be clustered outside of the 30 percent slope areas (and preferably on land less than 15 percent in slope) where possible.

Source: City of Petaluma General Plan Last updated June 3, 2019
Naturalness of 500-year floodplain

How much of a 500-year floodplain has been been left untouched by urban and industrial purposes such as sewers, dam building, hydroelectric power, and drinking water, such that the area still retains a complete or almost complete complement of species native to the area within a more-or-less naturally functioning ecosystem.

Source: Custom TNC product (not available for download) Minimum Acreage Threshold: 100.0 acres Last updated June 3, 2019
Naturalness of Active River Area

Those parts of the Active River Area that are still in a natural or semi-natural condition and are assumed to contribute to healthy river/stream function and water-related ecosystem services. These parts include the material contribution areas, the meander belts, the floodplains, and riparian wetlands of a river or stream. The degree of naturalness is used as an indicator of watershed health in the California Integrated Assessment of Watershed Health.

Source: California Integrated Assessment of Watershed Health (PDF report) Minimum Acreage Threshold: 100.0 acres Last updated June 3, 2019
Natural Resources Plan: Riparian Resources Protection (NR-1 to NR-9)

Jurisdiction: Healdsburg. Protection: A series of Implementation Measures directed towards protecting the City’s riparian resources. The City's Land Use designations provide for a 100-foot setback from the Russian River, a 35-foot setback from Foss Creek, and a 25-foot setback from other streams with riparian vegetation and/or aquatic life, as measured from the top of the existing or proposed bank, whichever is greater.  

Source: City of Healdsburg General Plan Last updated June 3, 2019
Natural Resources Policy: Stream and Riverbank Protection (NR-1.1)

Jurisdiction: Napa (city). Protection: The City shall protect riparian habitat along the Napa River and its tributaries from incompatible urban uses and activities. Policy NR-1.4 establishes that the City will review all future waterway improvement projects (e.g., flood control, dredging, private development), as well as all projects that are within 100 feet of the waterway, to ensure that they protect and minimize effects on the riparian and aquatic habitats.  Native plantings are encouraged along waterways to stabilize banks and reduce stormwater runoff.

Source: City of Napa General Plan Last updated June 3, 2019
Northern Spotted Owl

Jurisdiction: U.S. Fish & Wildlife Service, Alameda County, Contra Costa County. Protection: The U.S. Fish and Wildlife Service listed the northern spotted owl as threatened under the Endangered Species Act in 1990. USFWS first designated critical habitat for the spotted owl in 1992. The designation was revised in 2008 and a new final rule designating critical habitat was published in December 2012. 

Source: U.S. Fish & Wildlife Service Last updated June 3, 2019
Open Space and Conservation of Resources

Jurisdiction: Benicia. Protection: Hillside areas that have slope over 30 percent are to be kept as open space areas.

Source: City of Benicia General Plan Last updated June 3, 2019
Open Space and Conservation Plan (Policy OSC-22)

Jurisdiction: Tiburon. Protection: 50- to 100-foot setback from riparian buffer. An environmental assessment is required for developments proposed on sites that may contain special-status species, sensitive natural communities, native wildlife nurseries and nesting locations. In addition, the Town strongly discourages development on slopes exceeding 40%.

Source: City of Tiburon General Plan Last updated June 3, 2019
Open Space and Conservation Plan (Policy P10)

Jurisdiction: Livermore. Protection: No building may be located in a riparian corridor, defined as areas within 200 feet from the center of a permanent or intermittent stream. No development, conversion to cultivated agriculture, or keeping of animals may be permitted that materially reduces the quantity or quality of water in a corridor. Dams to store water for agriculture may be permitted, however, provided water is released in quantities and at times so as not to impair aquatic life or riparian vegetation. 

Source: City of Livermore General Plan Last updated June 3, 2019
Open Space and Conservation Plan (Policy P8.3)

Jurisdiction: San Ramon. Protection: Retain hillsides steeper than 20 percent slope as open space, except for slopes and ridgelines that may be altered. 100 foot buffer from riparian centerline. 

Source: City of San Ramon General Plan Last updated June 3, 2019
Open Space and Conservation (Policy P2.1-2, P2.1-3)

Jurisdiction: Calistoga. Protection: All waterways shall be buffered to prevent development in riparian setback area and preserve the open space associated with rivers and streams in Calistoga. A minimum of 30-foot setbacks shall be required from the top of the high bank. Developments within a protective stream buffer must include a riparian habitat management plan. Moreover, all waterways shall be buffered to prevent development and preserve open spaces around rivers and streams.

Source: City of Calistoga General Plan Last updated June 3, 2019
Open Space Element (Principle 14)

Jurisdiction: Portola Valley. Protection: Areas hazardous to the public safety and welfare should be retained as open space. Such areas include: slopes generally over 30 percent; fault zones - bands on either side of known fault traces sufficient to include lands of probable ground rupture; areas of geologic instability; and streams and their flood plains.

Source: Town of Portola Valley General Plan Last updated June 3, 2019
Open Space (Policy B)

Jurisdiction: Larkspur. Protection: Designate and preserve in open space the areas those portions of the Northridge that are above the 350-foot elevation, Baltimore canyon, the Piedmont and Redwood Avenue areas, Big and Little King Mountains and their saddle area, the Tubb Lake watershed, and the ridge above the old quarries on the San Quentin Peninsula. 

Source: City of Larkspur General Plan Last updated June 3, 2019
Open Space (Policy OSC-B-5)

Jurisdiction: Santa Rosa. Protection: Require a Hillside Development Permit as part of a proposed subdivision, proposed development, or new land use on that portion of a site with a slope of 10 percent or greater.

Source: City of Santa Rosa General Plan Last updated June 3, 2019
Open Space Policy Protection 2017

Open space is addressed by policy measures that vary in their efficacy at protecting farmland, riparian resources, or natural resource lands. "High policy protection lands" are protected by one or more policy measures that prohibit most urban development on that land. "Medium policy protection lands" are protected by one or more policy measures where development is intended to be limited but is still possible with a special permit. "Low policy protection lands" do not fall under any specific protective policy measures.

Last updated June 3, 2019
Open Space Preservation (Policy OS1.5)

Jurisdiction: Moraga. Protection: Development shall be prohibited on slopes with grades of twenty percent (20%) or greater and on the crests of minor ridgelines, defined as any ridgeline with an elevation greater than 800 feet above mean sea level. 

Last updated June 3, 2019
Open Space Reserve (Ord 18.11.010)

Jurisdiction: Half Moon Bay. Protection: The city has designated portion of areas as open space reserve consistent with the local coastal program land use plan; including areas currently in some form of agricultural use and areas not now in production. These areas will be converted to urban uses only after all other areas designated for urban development in the local coastal program and general plan have been substantially developed.

Source: Half Moon Bay Municipal Code Last updated June 3, 2019
Orderly Growth Initiative (Measure T)

Jurisdiction: Solano County. Protection: The County's 1994 Orderly Growth Initiative directed residential growth into the county's seven cities, rather than the unincorporated areas. Lands zoned for agriculture cannot change without a popular vote thereby supporting the County's economy and quality of life. Measure T was an amendment that preserved and updated the Orderly Growth Initiative; it was approved by voters in 2008. This measure readopted the Orderly Growth Initiative’s policies that strictly limit the Board of Supervisor’s ability to change the designation of “Agriculture” or “Open Space” lands through the year 2028 and updated the Orderly Growth Initiative’s density standards for development of “Agriculture” or “Open Space” lands and extend the effect of those density standards through the year 2028.

Source: Solano County Ordinance 2008-01 Last updated June 3, 2019
Ordinance 32-69.4

Jurisdiction: Danville. Protection: No development is permitted within one hundred (100) feet (measured vertically) of the centerline of a major ridgeline (the line running along the highest portion) or on a slope of less than 30 percent in steepness, except when an exception is granted by the Planning Commission. 

Source: City of Danville Municipal Code Last updated June 3, 2019
Park Need

ParkServe® provides in-depth data to guide local park improvement efforts. It provides data from 13,931 cities and towns, covering more than 80% of the U.S. population. The web-based tool can determine the percentage of residents who live within a 10-minute walk of a local park, and identify the neighborhoods most in need of new parks. 

Source: The Trust for Public Land Last updated June 3, 2019
Particulate Pollution Exposure

The risk of air pollution exposure  to particulate matter of 2.5 micrometers or less (PM2.5) from mobile and stationary sources, as identified in Plan Bay Area 2040. High risk areas show a PM2.5 concentration greater than 0.8 μg/m3, which tends to occur along high-traffic freeways and rail lines, locations with numerous stationary sources, and locations where a single stationary source has very high estimated PM2.5 risk.

Source: Bay Area Air Quality Management District. Plan Bay Area Draft Environmental Impact Report, page 2-2.41 of the Air Quality section. Last updated June 3, 2019
Policy A.1.1

Jurisdiction: Windsor. Protection: The Town requires development proposals on slopes of 20 percent or greater to include assessments of slope stability, susceptibility to landslide, and erodibility, prepared by certified engineering geologists. 

Source: Town of Windsor General Plan Last updated June 3, 2019
Policy for Reduction of Soil Erosion (OSRC-11a, 11b)

Jurisdiction: Sonoma County. Protection: Design discretionary projects so that structures and roads are not located on slopes of 30 percent or greater. Include erosion control measures for any discretionary project involving construction or grading on lands with slopes over 10 percent.

Source: Sonoma County General Plan Last updated June 3, 2019
Policy LU-P24.1

Jurisdiction: Vacaville. Protection: Ridges and slopes of 25 percent and greater shall remain undeveloped in order to maintain agricultural grazing areas, protect the public health and safety, and provide for community separation and open space, except that a limited area of golf course development with minimized grading may be permitted.

Source: City of Vacaville General Plan Last updated June 3, 2019
Policy N-9, N-10, N-11

Jurisdiction: Palo Alto. Protection: The City amended its Stream Protection Ordinance in 2017 to establish 150 feet as the desired stream setback along natural creeks in open space and rural areas west of Foothill Expressway. This 150-foot setback would prohibit the siting of buildings and other structures, impervious surfaces, outdoor activity areas and ornamental landscaped areas within 150 feet of the top of a creek bank. 

Pollution Cancer Exposure Risk

The air pollution exposure risk to cancer causing emissions from mobile and stationary sources as identified in Plan Bay Area 2040. High risk areas show increased cancer risk is greater than 100 in a million which tend to occur along high traffic freeways and rail lines, locations with numerous stationary sources, and locations where a single stationary source has very high estimated cancer risk.

Source: Bay Area Air Quality Management District. Plan Bay Area Draft Environmental Impact Report, page 2-2.41 of the Air Quality section. Last updated Aug. 30, 2018
Portola Valley Ordinance 2007-369

Jurisdiction: Portola Valley Protection: In 2007, the Town added Section 18.59 to the Municipal Code, which provides for the following creek setbacks: Parcels less than one acre in size: 30 feet from top of bank, or thirty-five feet from ordinary high water mark; Parcels of one acre to two and one-half acres: 45 feet from top of bank or fifty feet from ordinary high water mark; and Parcels of two and one-half acres or more, including new subdivisions—55 feet from top of bank or 60 feet from ordinary high water mark.

 

Source: Town of Portola Valley Municipal Code Last updated June 3, 2019
Preservation of Hillside Areas as Open Space (Action 4.1)

Jurisdiction: Morgan Hill Protection: Action NRE-2E: Hillside Ordinance should be applied to development on areas with an average slope in excess of 10 percent. 

Source: City of Morgan Hill General Plan Last updated June 3, 2019
Preservation of Hillside Areas as Open Space (Action 4.5)

Jurisdiction: Morgan Hill Protection: Action NRE-2B: Preserve El Toro Mountain at an elevation above 500 feet and Llagas and Paradise Valleys above 600 feet.

Source: City of Morgan Hill General Plan Last updated June 3, 2019
Preservation of Hillside Areas as Open Space (Actions 4.1, 4.5)

Jurisdiction: Morgan Hill. Protection: Action NRE-2E: Hillside Ordinance should be applied to development on areas with an average slope in excess of 10 percent. Action NRE-2B: Preserve El Toro Mountain at an elevation above 500 feet and Llagas and Paradise Valleys above 600 feet.

Source: Morgan Hill General Plan Last updated June 3, 2019
Prime farmland

Farmland with the best combination of physical and chemical features able to sustain long term agricultural production. This land has the soil quality, growing season, and moisture supply needed to produce sustained high yields. To be classified as Prime Farmland, land must have been used for irrigated agricultural production in the last four years.

Source: Prime Farmland and Farmland of Statewide Importance Minimum Acreage Threshold: 10.0 acres Last updated June 3, 2019
Priority Conservation Areas 2015

Lands that provide agricultural, natural resource, scenic, recreational, and/or ecological values and ecosystem functions. These areas are identified through consensus by local jurisdictions and park/open space districts as lands in need of protection due to pressure from urban development or other factors. PCAs are categorized by four designations: Natural Landscapes, Agricultural Lands, Urban Greening and Regional Recreation.

Source: Association of Bay Area Governments Last updated June 4, 2019
Priority Development Areas

 Priority Development Areas represent areas identified and delineated by local jurisdictions as part of the region's Sustainable Communities Strategy, for new and/or intensified development. 

Source: Metropolitan Transportation Commission Last updated June 4, 2019
Priority groundwater basins

California Statewide Groundwater Elevation Monitoring priority basins are determined by the California Department of Water Resources (CDWR) according to the following criteria: overlying population, projected growth of overlying population; public supply wells; total wells; overlying irrigated acreage; reliance on groundwater as the primary source of water; impacts on the groundwater, including overdraft, subsidence, saline intrusion, and other water quality degradation; and any other information determined to be relevant by CDWR.

Source: California Department of Water Resources Minimum Acreage Threshold: 100.0 acres Last updated June 4, 2019
Prominent Ridgelines and Slopes (Ordinance 19.40.050)

Jurisdiction: Cupertino. Protection: New structures shall not disrupt a 15% site line from a prominent ridge, measured from the top of ridge at the closest point from the structure. Hillside exception required for development greater than 500 square feet area on slopes equal to or greater than 30 percent.

Source: City of Cupertino Municipal Code Last updated June 4, 2019
Protect and Preserve Open Space (Policy 1.2: Program 1.2)

Jurisdiction: Los Altos. Protection: Continue to identify and acquire additional land for parks and recreational uses. Leave intact and put requirements to set aside of development generally on areas in excess of 30 percent hillside slope.

Source: City of Los Altos General Plan Last updated June 4, 2019
Protected lands by fee or easement

Land that has a permanent limitation on development (i.e., conversion to intensive human uses). Permanent protection typically comes in the form of fee title ownership by a conservation or park entity (e.g. land trust, open space district, regional/state/federal park agency) or via a conservation easement established by the propoerty owner. Examples of land protected by fee title ownership include dedicated parkland or nature preserves.

Source: Bay Area Protected Areas Database, December 2016 Last updated June 4, 2019
Protection of Ridges (Policy 2.7)

Jurisdiction: San Anselmo. Protection: The ridge zone shall extend 150 horizontal feet in both directions from the lowest elevation of the ridgeline, or 50 feet vertically, whichever is more restrictive. All lands located above the 150 foot mean sea level elevation are to be placed in a special conservation zone, and residential development is to be limited to a density of one unit per acre or less. the Town intends to review the building location, access, and exterior design of structures proposed for vacant lots in this area.

Source: Town of San Anselmo General Plan Last updated June 4, 2019
Publicly accessible recreational lands

Publicly accessible parks, preserves and trails, ranging in size from less than one acre to over 50,000 acres, and managed and maintained by the region's many local, regional, state, and federal agencies and organizations.

Source: Bay Area Protected Areas Database, 2017 Last updated June 4, 2019
Rainfall-induced Landslides

This shows the distribution of landslides evident in the landscape, most of which are slumps, translational slides, and earth flows. These are of interest both for evaluation of hazard risk and for use in further study of landslides. Future movement of such landslides is most likely to occur within and around the places where they have previously occurred. 

Source: U.S. Geological Survey Last updated June 4, 2019
Rare and Protected Species

Species that are known to be uncommon or declining and therefore have been given federal or state statutory protection to maintain their survival.

Source: California Natural Diversity Database Minimum Acreage Threshold: 20.0 acres Last updated June 4, 2019
Regional Connectivity

A broad picture of regional habitat connectivity for plant and animal species whose movement may be inhibited by developed or agricultural land uses.

Source: Custom TNC product (not available for download) Last updated June 4, 2019
Regional Connectivity - Channelized

These areas of channelized connectivity represent the last remaining natural habitat linkages through a region. A landscape of connected habitats is critical to the survival of wildlife and plants by enabling movement for daily activity and dispersal. In a changing climate, connectivity will become even more important to species survival by enabling species to move to more suitable habitat as needed.

Source: Custom TNC product (not available for download) Minimum Acreage Threshold: 8.0 acres Last updated June 4, 2019
Regional Connectivity - Diffuse

These areas of diffuse connectivity contribute to regional connectivity as broad, unfragmented lands that allow wildlife and plants to move freely. A landscape of connected habitats is critical to the survival of wildlife and plants by enabling movement for daily activity and dispersal. In a changing climate, connectivity will become even more important to species survival by enabling species to move to more suitable habitat as needed.

Source: Custom TNC product (not available for download) Minimum Acreage Threshold: 8.0 acres
Regional Connectivity - Intensified

These areas of intensified connectivity are natural lands that provide the few remaining options for natural habit linkages through a region. A landscape of connected habitats is critical to the survival of wildlife and plants by enabling movement for daily activity and dispersal. In a changing climate, connectivity will become even more important to species survival by enabling species to move to more suitable habitat as needed.

Source: Custom TNC product (not available for download) Minimum Acreage Threshold: 8.0 acres
Regional Open Space Preserves (Policy OS.6.3)

Jurisdiction: City of Fairfield. Protection: all integration of new open space will be  compatible with adjacent areas so as to create a natural topographical appearance and avoid abrupt changes in slope.

Source: City of Fairfield General Plan Last updated June 4, 2019
Regional Trails

Regional trails and trail systems are designed to serve populations greater than one community, often connecting multiple communities. Regional trails can be paved or unpaved and are mostly off-street. The Bay Area has well over a thousand miles of regional trails. The two premier regional trails are the Bay Area Ridge Trail, which circles the San Francisco Bay along the mountain ridgelines, and the San Francisco Bay Trail, which encircles the Bay at the shoreline. Other regional trails include the California Coastal Trail, Juan Bautista de Anza National Historic Trail, Napa Valley Vine Trail, the West County Trail in Sonoma County, and many hundreds of miles of paved off-street trails in Contra Costa County managed by East Bay Regional Park District. Trail completion is a priority of Bay Area conservation and recreation agencies and organizations and was also a focus of many Priority Conservation Areas submitted to the Association of Bay Area Governments in 2015.

Source: Greenbelt Alliance Last updated June 4, 2019
Report Field: Amount Protected in Bay Area

Of the given metric (e.g. acreage of baylands), the total amount in the Bay Area that is protected by policies, fee ownership, or easements.

Last updated June 4, 2019
Report Field: Amount Protected in County

Of the given metric (e.g. acreage of baylands), the total amount in the County that is protected by policies, fee ownership, or easements.This is only presented if the analyzed area fits entirely within one county.

Last updated June 4, 2019
Report Field: Contribution to Bay Area Total

The proportion of a given metric (e.g. acreage which is protected by easement) that lies within your analyzed area, compared to the entire Bay Area. For example, a 10% value for Baylands would indicate that the Baylands in your analyzed area constitute 10% of the Baylands in the entire Bay Area.

Last updated June 4, 2019
Report Field: Contribution to County Total

The proportion of a given metric (e.g. acreage which is protected by easement) that lies within your analyzed area, compared to the entire county. For example, a 10% value for Baylands would indicate that the Baylands in your analyzed area constitute 10% of the Baylands in the entire county. This field is only displayed if the analyzed area fits entirely within a single county.

Last updated June 4, 2019
Report Field: Contribution to Watershed Total

The proportion of a given metric (e.g. acreage which is protected by easement) that lies within your analyzed area, compared to the entire watershed. For example, a 10% value for Baylands would indicate that the Baylands in your analyzed area constitutes 10% of the Baylands in the entire watershed. This field is only displayed if the analyzed area fits entirely within a single watershed.

Last updated June 4, 2019
Report Field: Metric

The metric being reported, e.g. Baylands.

Last updated June 4, 2019
Report Field: Percentage of Shape

The percentage of your analyzed area's acreage that fits into the given metric category. For example, a 12% for "Farmland of Local Importance" indicates that 12% of your analyzed area fits into that category. This is presented only for acreage-based metrics.

Last updated June 4, 2019
Report Field: Values and Units

Metrics reported by the analysis tool are expressed in a variety of units: acreage, linear mileage, actual count, rating or score, and so on. The values represented should always be taken along with the units in which they are presented.

Last updated June 4, 2019
Reservoir catchment areas

Surface water storage watersheds are identified by the combined volume of all reservoirs within their watershed system and measured according to the average reservoir storage volume.

Source: Greenbelt Alliance Minimum Acreage Threshold: 100.0 acres Last updated June 4, 2019
Residential Communities Design Principles (Policy 1.11.7b)

Jurisdiction: American Canyon. Protection: Require developments to preserve the topographic character of hillsides and canyons by concentrating projects on lesser slopes; no mass grading on slopes exceeding 25 percent.

Source: City of American Canyon General Plan Last updated June 4, 2019
Residential Communities Design Principles (Policy 1.11.7c)

Jurisdiction: American Canyon.Protection: Prohibition of development on slopes exceeding 50 percent and maintenance of natural grades in higher elevation areas.

Source: City of American Canyon General Plan Last updated June 4, 2019
Residential Uses (Policy 26)

Jurisdiction: Alameda County. Protection: In no case shall required housing be built on or which protrudes over hilltops or ridgelines, on slopes of more than 20 percent,critical wildlife habitat, or within 100 feet of a riparian corridor.

Source: East Alameda County Area Plan Last updated June 6, 2019
Resource Conservation & Management Plan

Jurisdiction: Rio Vista. Protection: General guidelines for setbacks are 100 feet from the edge of perennial streams; 50 feet from the edge of intermittent streams; and 50 feet from the edge of sensitive habitats, including riparian zones, wetlands, and habitats of rare, threatened, and endangered species. 

Source: City of Rio Vista General Plan Last updated June 6, 2019
Resource Conservation Overlay

Jurisdiction: Solano County. Protection: Solano's Resource Conservation Overlay identifies and protects areas of the county with special resource management needs. The overlay protects resources by (1) requiring study of potential effects if development is proposed in these locations, and (2) providing mitigation to support urban development in cities.

Source: Solano County General Plan Last updated June 6, 2019
Resource Implementation Program (RS.I-67)

Jurisdiction: Solano County. Protection: This policy in the General Plan called for an ordinance to be developed that protects riparian water quality through proper buffer zones that keep riparian areas an appropriate width apart from one another depending upon the size of the developed land. This ordinance was not developed; however, the County considers imposing buffers as needed based on the potential environmental impacts identified in a CEQA report.

Source: Personal communication, Solana County Planning Department Last updated June 6, 2019
Ridge and Upland Greenbelt (Program DES-4.e)

Jurisdiction: Marin County. Protection: Protect views of the Ridge and Upland Greenbelt Areas by amending policies and maps to identify a border on parcels that abut the area. For example, Ridge and Upland Greenbelt lands would be rezoned to the Planned District category and adjacent buffer areas to a transitional district, thereby subjecting them to County Design Review Requirements that include visually sensitive designs and rural densities.

Source: Marin County General Plan Last updated June 6, 2019
Ridgeline Development (Ordinance 17.060.050)

Jurisdiction: Fairfax Protection: Development within a ridgeline scenic corridor, defined as the area on either side of the ridgeline within 150 feet horizontal distance measured at right angles to the ridgeline or 100 feet vertically of the major ridge, whichever is a greater, requires additional permitting.

Source: Fairfax Municipal Code Last updated June 6, 2019
Ridgeline Policies (Policies OSC-10, OSC-11)

Jurisdiction: Tiburon. Protection: When considering open space and development interests, undeveloped ridgelines are to have the highest priority. Developments and landscaping shall be setback a minimum of 150 horizontal feet and 50 vertical feet of either side of Tiburon Ridge.

Source: City of Tiburon General Plan Last updated June 6, 2019
Ridgelines and Hillsides Protection (Measure PP)

Jurisdiction: Pleasanton. Protection: Adopted by voters in 2008, Measure PP prohibits placing housing units or structures on slopes of 25 percent or greater or within 100 vertical feet of a ridgeline  and prohibits grading to construct residential or commercial structures in those same areas.

Source: City of Pleasanton General Plan Last updated June 6, 2019
Ridgelines and Hillsides Protection (Program 21.3)

Jurisdiction: Pleasanton. Protection: This measure implements Measure PP and QQ, by prohibiting the development of housing units or structures on slopes of 25 percent or greater or within 100 vertical feet of a ridgeline.

Source: City of Pleasanton General Plan Last updated June 6, 2019
Riparian Corridors (Policy ER-2.2)

Jurisdiction: San Jose. Protection: Provide 100 foot setback from riparian habitat. Ensure developments are consistent with City's Riparian Corridor Policy. Implement appropriate measures to restore, and/or mitigate damage to riparian corridors; update Policy; restrict or carefully regulate development in streamside areas.

Source: City of San Jose General Plan Last updated June 6, 2019
Riparian Corridors (Policy OS-30)

Jurisdiction: Rohnert Park. Protection: Environmental Conservation Measure (EC)-13 establishes creek protection zones extending a minimum of 50 feet (measured from the tops of the banks and a strip of land extending laterally outward from the top of each bank) for creeks, with extended buffers where significant habitat areas or high potential wetlands exist. Wider buffers are to be established in significant habitat areas. No development is allowed in these areas except for greenway enhancements such as trails and bikeways.

Source: City of Rohnert Park General Plan Last updated June 6, 2019
Riparian Policies

Riparian policies limit or prohibit new construction within a certain buffered distance from rivers and streams to avoid adverse impacts of urban development on water quality, scenic and recreational values, and other ecosystem services.

Source: Greenbelt Alliance Last updated June 6, 2019
Runoff

Water that flows over the surface of the land into streams and rivers

Source: USGS-BCM (Flint and Flint) Minimum Acreage Threshold: 633.0 acres Last updated June 6, 2019
San Bruno Mountain Area (HCP)

Jurisdiction: San Mateo County. Protection: The main goal of a Habitat Conservation Plan (HCP) is to gain authorization for incidental take of covered endangered or threatened species under the ESA and the NCCP Act for activities which will occur in accordance with approved land-use and capital-improvement plans.The San Bruno Mountain Area HCP was created to protect and improve habitat for endangered species on San Bruno Mountain including the mission blue, callippe silverspot, San Bruno elfin and bay checkerspot butterflies, as well as the overall native ecosystem of San Bruno Mountain.

Source: San Bruno Mountain Habitat Conservation Plan Last updated June 6, 2019
San Jose Coyote Valley Greenbelt

Jurisdiction: Morgan Hill. Protection: Policy NRE-3.2 instructs the City of Morgan Hill to work in collaboration with the City of San Jose and Santa Clara County in order to ensure the San Jose Coyote Valley Greenbelt continues providing the non-urban buffer for the north side of Morgan Hill.

Source: Morgan Hill General Plan Last updated June 6, 2019
Santa Clara County Habitat Conservation Plan: Riparian Policy

Jurisdiction: Santa Clara Valley Habitat Agency, Gilroy, Morgan Hill, San José, Santa Clara County, Santa Clara Valley Water District, and Santa Clara Valley Transportation Authority (Partners). Protection: A primary goal of any Habitat Conservation Plan (HCP) is to obtain authorization for incidental take of covered species under the ESA and the NCCP Act for covered activities which will occur in accordance with approved land-use and capital-improvement plans. The Plan allows the six Partners to receive endangered species permits for activities and projects they conduct and those under their jurisdiction. Protections include a 100-to 200-foot riparian buffer around Category 1 streams. 

Source: Santa Clara Valley Habitat Conservation Plan Last updated June 6, 2019
Santa Clara Valley (NCCP/HCP)

Jurisdiction: Santa Clara Valley Habitat Agency, Gilroy, Morgan Hill, San José, Santa Clara County, Santa Clara Valley Water District, and Santa Clara Valley Transportation Authority (Partners). Protection: A primary goal of any Habitat Conservation Plan (HCP) is to obtain authorization for incidental take of covered species under the ESA and the NCCP Act for covered activities which will occur in accordance with approved land-use and capital-improvement plans. The Plan allows the six Partners to receive endangered species permits for activities and projects they conduct and those under their jurisdiction. 

Source: Santa Clara Valley Habitat Conservation Plan Last updated June 6, 2019
Santa Cruz Tarplant

Jurisdiction: U.S. Fish & Wildlife Service, Alameda County, Contra Costa County. Protection: Santa Cruz tarplant is a California endangered plant species, which means that killing or possessing plants is prohibited by the California Endangered Species Act (CESA). The species is also listed as threatened under the federal Endangered Species Act. USFWS designated critical habitat for this species in 2002.

Source: U.S. Fish & Wildlife Service Last updated June 6, 2019
Santa Rosa Plain Conservation Strategy Study Area

Jurisdiction: U.S. Fish & Wildlife Service, Alameda County, Contra Costa County. Protection: The Conservation Strategy, adopted in December 2005, provides the biological framework for conservation of the endangered California tiger salamander and four rare plant species found in conjunction with wetland habitat on the Santa Rosa Plain. It identifies conservation areas and mitigation requirements for development projects that will impact the habitat of these protected species. It is being implemented by the County of Sonoma and the Cities of Santa Rosa, Rohnert Park, and Cotati, and the Town of Windsor.

Source: Santa Rosa General Plan Last updated June 6, 2019
Scenic Landscape Unit (Policy OSRC-2a)

Jurisdiction: Sonoma County. Protection: To retain the largely open, scenic character of important Scenic Landscape Units, this policy directs the County to avoid amendments to increase residential density in Scenic Landscape Units in excess of one unit per ten acres. The land use plan may designate a lower density or larger minimum lot size.

Source: Sonoma County General Plan Last updated June 6, 2019
Scenic Resources Policies (Policies 9-14, 9-21)

Jurisdiction: Contra Costa County. Protection: Development on open hillsides and significant ridgelines shall be restricted. Slopes of 26 percent or more should generally be protected. Additionally, there should be no construction within 50 feet or on top of major scenic ridgelines. Any new development shall be encouraged to generally conform with natural contours to avoid excessive grading. Extreme topographic modification, such as filling in canyons or removing hilltops, shall be avoided. 

Source: Contra Costy County General Plan Last updated June 6, 2019
Sea level rise

The risks of both storm surge flooding and sea level rise are expected to increase with climate change. To characterize these risks, a sea level rise scenario (50 cm of rise with a 100-year storm event) and a flooding scenario (a 500-year flood) were combined to form a single likely water-related hazard zone, given expected climate change for the region.

Source: USGS, Our Coast Our Future - Flood Map Last updated June 6, 2019
Sea level rise -- 5' inundation area

Global warming is melting polar ice, which is causing the level of the sea to rise. Climate projections for the Bay Area over the next 80 years include possible sea level rise of five feet by the year 2100.

Source: NOAA Last updated June 6, 2019
Seismic Hazard

This hazard layer is used to display the composite shaking risk across the Bay Area, based on all earthquake scenarios and probability information using the Modified Mercalli Intensity (MMI) scale. The layer shows likely shaking intensity in the Bay Area in any 50-year period from all possible faults.

Source: USGS, Association of Bay Area Governments Last updated June 6, 2019
Sensitive Habitat: Riparian Corridor (Policy 7.11)

Jurisdiction: San Mateo County. Protection: Local Coastal Program establishes buffer zones 50 feet outward on both sides of riparian corridors from the “limit of riparian vegetation” for perennial streams and 30 feet outward for intermittent streams. Where no riparian vegetation exists along both sides of riparian corridors, extend buffer zones 50 feet from the predictable high water point for perennial streams and 30 feet from the midpoint of intermittent streams. No new residential parcels shall be created whose only building site is in the buffer area.

Source: County of San Mateo, Local Coastal Program Policies Last updated June 6, 2019
Sensitive Local Resource Areas

Jurisdiction: Rio Vista. Protection: These areas are defined as “areas possessing one or more natural resources that, when taken together, create a feature that is uniquely representative of Rio Vista’s character.” The City shall ensure that the development process respects the unique characteristics and  functions of Sensitive Local Resource Areas. The preferred treatment is first, avoidance of disturbance; second, on-site restoration; third, in-kind restoration; then, other approaches or mitigation. General guidelines for setbacks will include 100 feet from the edge of perennial streams; 50 feet from the edge of intermittent streams; and 50 feet from the edge of sensitive habitats, including riparian zones, wetlands, and habitats of rare, threatened, and endangered species. 

 

Source: City of Rio Vista General Plan Last updated June 6, 2019
Single-Family Residential: Conservation

Jurisdiction: San Anselmo. Protection:  The Single-Family Residential-Conservation designation is assigned to those residential properties that are one acre or more and are located at or above the 150 foot mean sea level elevation, but outside of the land designated as Very Low Density (Hillside and Ridge). In order to preserve the unique visual qualities of these lands, development is to be limited to a density of one unit per acre or less.

Source: Town of San Anselmo General Plan Last updated June 6, 2019
Single-Family Residential: Conservation and Protection of Ridges Policy 2.7

Jurisdiction: San Anselmo. Protection: The ridge zone shall extend 150 horizontal feet in both directions from the lowest elevation of the ridgeline, or 50 feet vertically, whichever is more restrictive. Development on land with an elevation above 150 feet will be limited by Town Engineer and Planning Commission review.

Source: Town of San Anselmo General Plan Last updated June 6, 2019
Site Grading (Policy 10)

Jurisdiction: Saratoga.Protection: Construction is not allowed in an area with an average slope that exceeds 30 percent or an area that exceeds 40 percent natural slope under the structure. Additional requirement must be consistent the Measure "A" area, or hillside specific plan.

Source: City of Saratoga General Plan Last updated June 6, 2019
Slope Restrictions (Policy 25.11)

Jurisdiction: Gilroy. Protection:  Slopes greater than 30 percent, areas of high landslide risk, and areas with highly expansive soils on slopes greater than 10 percent are not suitable for development and will remain open space. Slopes of 10 to 30 percent may be suitable for low intensity, low density development, subject to site-specific review and approval.

Source: City of Gilroy General Plan Last updated June 6, 2019
Soft Bird's-Beak

Jurisdiction: U.S. Fish & Wildlife Service, Alameda County, Contra Costa County. Protection: This plant species was federally listed as endangered throughout its range in 1997. It is state-listed as rare. USFWS designated critical habitat for this species in 2007. 

Source: U.S. Fish & Wildlife Service Last updated June 6, 2019
Soil Carbon Storage

The carbon content in soil organic matter from microorganisms, root exudates, decomposed organisms, and soil biota. Soil organic carbon storage is summarized to a depth of 30cm.

Source: USDA NRCS, version 2.2 2019 Last updated June 6, 2019
Solano Multi-Species (HCP)

Jurisdiction: Solano County Water Agency, Vacaville, Fairfield, Suisun City, Vallejo, Solano Irrigation District, Maine Prairie Water District. Protection: The Solano HCP establishes a framework for complying with endangered species regulations requiring permits for incidental take of protected species, while accommodating future urban growth, development of water-related and other public infrastructure undertaken by the Plan Participants.

Source: Solano Multispecies Habitat Conservation Plan Last updated June 6, 2019
Sonoma County Biotic Habitat designation

Jurisdiction: Sonoma County. Protection: Identify and protect native vegetation and wildlife, particularly occurrences of special status species, wetlands, sensitive natural communities, woodlands, and areas of essential habitat connectivity. Protection of these areas helps to maintain the natural vegetation, support native plant and animal species, protect water quality and air quality, and preserve the quality of life, diversity and unique character of the County.

Source: Sonoma County General Plan Last updated June 6, 2019
Sonoma County Low/Highly Variable Water Yield Area (Zone 4)

Jurisdiction: Sonoma County. Protection: Policy WR-2e (formerly RC-3h) requires proof of groundwater with a sufficient yield and quality to support proposed uses in Class 3 and 4 water areas, and requires test wells or the establishment of community water systems in Class 4 water areas. 

Source: Sonoma County General Plan Last updated June 7, 2019
Sonoma County Marginal Groundwater Area (Zone 3)

Jurisdiction: Sonoma County. Protection: Protection: Policy WR-2e (formerly RC-3h) requires proof of groundwater with a sufficient yield and quality to support proposed uses in Class 3 and 4 water areas, and requires test wells or the establishment of community water systems in Class 4 water areas. Test wells may be required in Class 3 areas. 

Source: Sonoma County General Plan Last updated June 7, 2019
Sonoma County Open Space Habitat Connectivity Corridors

Jurisdiction: Sonoma County. Protection: In designated Habitat Connectivity Corridors, encourage property owners to consult with CA Department of Fish & Game, install wildlife friendly fencing, and provide for roadway undercrossings and oversized culverts and bridges to allow movement of terrestrial wildlife. Includes Sonoma Valley Corridor and Laguna West Corridor.

Source: Sonoma County General Plan Last updated June 7, 2019
Sonoma County Open Space Marshes/Wetlands

Jurisdiction: Sonoma county. Protection: Develop comprehensive programs for preservation and restoration of the freshwater marsh habitat of the Laguna de Santa Rosa area, the extensive marsh areas along the Petaluma River, other tidal marshes, and freshwater marshes such as the Pitkin, Kenwood, Cunningham, and Atascadero Marshes.

Source: Sonoma County General Plan Last updated June 7, 2019
Sonoma County Ordinance 6089

Jurisdiction: Sonoma County. Protection: Ordinance Number 6089 established Streamside Conservation Areas (SCAs) to protect and enhance riparian corridors along streams in order to balance multiple uses. SCAs include 200 feet from Russian River, 100 feet from Flatland and 50 feet from other riparian corridors.

Source: Sonoma County Zoning Ordinance Last updated June 7, 2019
South Livermore Valley Area Plan

Jurisdiction: Livermore. Protection: The South Livermore Valley Area Plan was adopted in 1993 to ensure an orderly development of the area. The Plan seeks to protect, enhance, and increase viticulture and other cultivated agriculture in the South Livermore Valley, by directing new residential development to appropriate locations, preserving existing vineyards and prime vineyard soils.

Source: South Livermore Valley Area Plan Last updated June 7, 2019
Sphere of Influence

A "Sphere of Influence" (SOI) is defined as a planning boundary outside of an agency's legal boundary (such as the city limit line) that designates the agency's probable future boundary and service area.

Source: Greenbelt Alliance Last updated June 7, 2019
Stanford (HCP)

Jurisdiction: Stanford University. Protection: The Stanford HCP establishes a comprehensive conservation program that protects, restores and enhances habitat areas; monitors and reports on covered species (California red-legged frog, California tiger salamander, and an intergrade form of the San Francisco gartersnake); and avoids and minimizes impacts on species and their habitats. The HCP also provides major new commitments of land protection, personnel, and resources dedicated to habitat conservation.

Source: Stanford Habitat Conservation Plan Last updated June 7, 2019
Steelhead (Endangered)

Jurisdiction: NOAA Fisheries, Alameda County, Contra Costa County. Protection: One distinct population segment (DPS) of steelhead trout is listed as endangered under the Endangered Species Act, and 10 DPS and 1 experimental non-essential population are listed as threatened. NOAA designated critical habitat for this species in 2005.

Source: NOAA Fisheries Last updated June 7, 2019
Steelhead (Threatened)

Jurisdiction: NOAA Fisheries, Alameda County, Contra Costa County. Protection: One distinct population segment (DPS) of steelhead trout is listed as endangered under the Endangered Species Act, and 10 DPS and 1 experimental non-essential population are listed as threatened. NOAA designated critical habitat for this species in 2005.

Source: NOAA Fisheries Last updated June 7, 2019
Steller Sea Lion

Jurisdiction: NOAA Fisheries, Alameda County, Contra Costa County Protection: Steller sea lions were first listed under the Endangered Species Act in 1990. In 1997 NOAA Fisheries recognized two populations, classifying the eastern population as threatened and the western population as endangered. The eastern population has since recovered and is no longer listed. The western population remains endangered. NOAA Fisheries designated critical habitat for this species in 1993.

Source: NOAA Fisheries Last updated June 7, 2019
Stream Conservation Areas (Policy BIO-4.1)

Jurisdiction: Marin County. Protection:  A Stream Conservation Area (SCA) is established to protect the active channel, water quality and flood control functions, and associated fish and wildlife habitat values along streams. Sets a 20-foot buffer minimum in city corridor; 100-foot minimum in coastal, baylands corridors; 20 feet minimum in streams. Inside the City-Centered Corridor, a setback from streams is 100 feet for parcels above 2 acres, 50 feet between 0.50 and 2 acres and 20 feet for 1/2 acres.

Source: Marin County General Plan Last updated June 10, 2019
Suisun Marsh Protection Area: Primary Management Area

Jurisdiction: San Francisco Bay Conservation and Development Commission (BCDC), Solano County, and the California Department of Fish and Game (DFG). Protection: This area consists of tidal marshes, seasonal marshes, managed wetlands and lowland grasslands. It is the intent for this area to remain in its existing marsh and related uses as provided for in the Suisun Marsh Local Protection Program. Within the Primary Management Area lands are generally to be retained in minimum parcel sizes of 250 acres. 

Source: Solano County General Plan Last updated June 10, 2019
Suisun Marsh Protection Area: Secondary Management Area

Jurisdiction: San Francisco Bay Conservation and Development Commission (BCDC), Solano County, and the Department of Fish and Game (DFG). Protection: Secondary management areas include the Western Hills region, Suisun Valley region, the Jepson Prairie Region, and the Montezuma Hills region. These areas consist of upland grasslands and agricultural lands and serve as a buffers to the wetland areas. The Secondary Management Area is designed to assure retention of upland areas adjacent to the marsh in uses compatible with its protection as provided for in the Suisun Marsh local Protection Program.

Source: Solano County General Plan Last updated June 10, 2019
Suisun Thistle

Jurisdiction: U.S. Fish & Wildlife Service, Alameda County, Contra Costa County. Protection: This species of thistle was listed by the USFWS as endangered in 1997. It is endemic to California, where it is found only in the San Francisco Bay Area and the Sacramento-San Joaquin River Delta. USFWS designated critical habitat for this species in 2007.

Source: U.S. Fish & Wildlife Service Last updated June 10, 2019
Tidewater Goby

Jurisdiction: U.S. Fish & Wildlife Service, Alameda County, Contra Costa County. Protection: USFWS listed this species as endangered in 1994. A revised critical habitat designation was published in 2013.

Source: U.S. Fish & Widlife Service Last updated June 10, 2019
Transit Priority Area

An area within one-half mile of an existing or planned major transit stop, if the planned stop is scheduled to be completed within the planning horizon included in a Transportation Improvement Program adopted pursuant to Section 450.216 or 450.322 of Title 23 of the Code of Federal Regulations. "Major transit stop" means a site containing an existing rail transit station, a ferry terminal served by either a bus or rail transit service, or the intersection of two or more major bus routes with a frequency of service interval of 15 minutes or less during the morning and afternoon peak commute periods. 

Transit Priority Areas may qualify for certain exemptions in the application of requirements of the California Environmental Quality Act (CEQA).

Source: California Office of Planning and Research Last updated June 10, 2019
Tsunami Inundation Area

The tsunami inundation map was prepared to assist cities and counties in identifying their tsunami hazard. It is intended for local jurisdictional coastal evacuation planning uses only. This map does not meet disclosure requirements for real estate transactions nor for any other regulatory purpose.

Source: State of California Last updated June 10, 2019
Unique farmland

Farmland of lesser quality soils used for the production of the State's leading agricultural crops. This land is usually irrigated, but may include non-irrigated orchards or vineyards as found in some climatic zones in California. Land must have been cropped in the last four years.

Source: Farmland Mapping and Monitoring Program, 2014 Minimum Acreage Threshold: 10.0 acres Last updated June 10, 2019
Urban Aquifer Recharge Potential

The groundwater recharge potential on developed lands represents the additional volume of water that could be recharged to groundwater basins if developed lands were converted to allow stormwater infiltration. Natural infrastructure especially above aquifers helps infiltrate water that would otherwise run off impervious surfaces.  However, groundwater recharge, especially in urban systems is complex, and potential pollutants from adjacent land should be evaluated very carefully before developing low impact development recharge projects. Site-scale tools such as GreenPlanIT can be used for planning  and stormwater professionals should be consulted for the design of facilities.

Source: Natural Capital Project Last updated March 1, 2019
Urban forest carbon

The estimated amount of carbon (measured in Metric Tons of CO2-equivalent) stored in street trees in urban areas. 

Source: UC Davis California Center for Urban Horticulture Minimum Acreage Threshold: 500 acres Last updated June 10, 2019
Urban Growth Boundary/Urban Limit Line

A planning boundary of a city and/or county that defines where urban growth can and cannot occur. UGBs are mapped from current General Plan maps and Local Agency Formation Commission documents.

Source: At Risk 2017 Last updated June 7, 2019
Urban Heat Island, Air Temperature

Large urban areas often experience higher temperatures, greater pollution, and more negative health impacts during hot summer months, when compared to more rural communities. This phenomenon is known as the urban heat island. Heat islands are created by a combination of heat-absorptive surfaces (such as dark pavement and roofing), heat-generating activities (such as engines and generators), and the absence of vegetation (which provides evaporative cooling).

Source: California Environmental Protection Agency Last updated June 10, 2019
Urban Heat Island, Surface Temperature

The land surface temperature layer (from 2010) combines land cover types from National Land Cover Database with thermal temperature from Landstat on developed lands to identify areas experiencing the urban heat island effect.

Source: University of California, Berkeley. Mapping Climate Change Exposures, Vulnerabilities, and Adaptation to Public Health Risks, p.59-Fig 21., 2011-2012 Last updated June 10, 2019
Urban Service Area

A planning area regulated by each county's Local Agency Formation Commission that delineates where land is available for development and services. California Gov. Code Section 56080 describes it as "undeveloped, or agricultural land, either incorporated or unincorporated, within the sphere of influence of a city, which is served by urban facilities, utilities, and services."

Source: Greenbelt Alliance
Vacaville-Dixon Greenbelt

Jurisdiction: Vacaville-Dixon Greenbelt Authority. Protection: The Vacaville-Dixon Greenbelt Agreement identifies approximately 1,000 acres of land located between Vacaville and Dixon that were purchased by the Vacaville-Dixon Greenbelt Authority (VDGA) to be maintained in productive agriculture or as other open space uses mutually agreed upon by VDGA.

 

Source: City of Vacaville General Plan Last updated June 10, 2019
Vacaville-Fairfield-Solano Greenbelt

Jurisdiction: Vacaville Fairfield-Solano Greenbelt Authority. Protection: The Vacaville-Fairfield-Solano Greenbelt Agreement identifies approximately 4,100 acres between Vacaville and Fairfield that must be preserved to serve as a permanent separation between the urban areas of Fairfield and Vacaville. This area must be maintained in agriculture and open space uses consistent with the provisions of the agreement. The greenbelt serves as a community separator, a setting for recreational activities, a buffer between agricultural and urban areas, and as an ultimate limit for urban growth.

Source: City of Vacaville General Plan Last updated June 10, 2019
Vernal Pool Fairy Shrimp

Jurisdiction: U.S. Fish & Wildlife Service, Alameda County, Contra Costa County. Protection: Vernal pool fairy shrimp are translucent, slender crustaceans (relatives of lobsters, crabs, saltwater shrimp and barnacles). USFWS listed this species as threatened in 1994, and published a revised final critical habitat designation in 2006. 

Source: U.S. Fish & Wildlife Service Last updated June 10, 2019
Vernal Pools

Vernal pools are seasonal depressional wetlands that are covered by shallow water for variable periods from winter to spring, but may be completely dry for most of the summer and fall. These wetlands range in size from small puddles to shallow lakes and are usually found in a gently sloping plain of grassland. The inventory in the Greenprint combines the knowledge of vernal pools and vernal pool complexes distributed across the Bay Area from local and federal agencies. Understanding the extent of these unique ecosystems is vital for the monitoring of and recovery planning for listed and sensitive species that are uniquely adapted to live in this environment.

Source: SFEI Minimum Acreage Threshold: 40.0 acres
Vernal Pool Tadpole Shrimp

Jurisdiction: U.S. Fish & Wildlife Service, Alameda County, Contra Costa County. Protection: Vernal pool tadppole shrimp are translucent, slender crustaceans (relatives of lobsters, crabs, saltwater shrimp and barnacles). USFWS listed this species as endangered in 1994, and published a revised final critical habitat designation in 2006. 

Source: U.S. Fish & Wildlife Service Last updated June 10, 2019
View Protection Program: Structures and Related Improvements

Jurisdiction: Napa County. Protection: Protects the scenic quality of the County both for visitors as well as residents. No building or other administrative permit shall be issued for any new structure or improvement to an existing structure if the structure is located on a slope of 15 percent or more, or if the structure is located on any minor or major ridgeline. 

Source: Napa County Code of Ordinances Last updated June 10, 2019
Water quality index

An index of water quality based on conductivity, turbidity, and nitrate concentration, based on the California Integrated Assessment of Watershed Health, conducted by the U.S. EPA (2013).

Source: California Integrated Assessment of Watershed Health Minimum Acreage Threshold: 100.0 acres Last updated June 10, 2019
Watershed Policies

Over the past 20 years, multiple initiatives have been undertaken to create a cohesive policy for application of statewide watershed management actions. These initiatives constitute the policy framework for watershed management within California. At the county level, such policies include voter-protected agricultural watershed county lands in Napa County's Measure J, Solano County's Orderly Growth Initiative for marsh and watershed designated lands, and groundwater policies in Sonoma County.

Source: Greenbelt Alliance Last updated June 10, 2019
Watersheds Boundary

Watershed boundaries are created based on topographic divides and delineated areas where surface water runoff drains into a common surface water body, such as a lake or section of a stream. It is important to consider that while watershed boundaries identify surface water runoff divides, they often do not represent groundwater flow divides. Groundwater flows generally follow the topographic flow direction, just as surface water runoff does. However, the movement of water in the subsurface is more complex and groundwater flow directions may not coincide with surface water flow directions.

Source: USGS Watershed Boundary Dataset Data Model (v2.2.1) (2013) Last updated June 10, 2019
Water Trail Launches

The Water Trail is a network of launch and landing sites around the San Francisco Bay. The sites allow people in human-powered boats and beachable sail craft to take single-day and multiple-day trips on the Bay.

Source: Metropolitan Transportation Commission Last updated June 10, 2019
Western Snowy Plover

Jurisdiction: U.S. Fish & Wildlife Service, Alameda County, Contra Costa County. Protection: USFWS listed the western snowy plover as threatened in 1993. A revised final critical habitat was published in 2011 along the coasts of California, Oregon and Washington. 

Last updated June 10, 2019
Wetlands

Areas where water covers the soil or is present either at or near the surface of the soil all year or for varying periods of time during the year, including during the growing season. Water saturation largely determines how the soil develops and the types of plant and animal communities that live in and on the soil. Wetlands may support both aquatic and terrestrial species. The prolonged presence of water creates conditions that favor the growth of specially adapted plants and promote the development of characteristic wetland soils. Wetlands provide habitat for fish, wildlife and plants--many of which have a commercial or recreational value--recharge groundwater, reduce flooding, provide clean drinking water, offer food and fiber, and support cultural and recreational activities.

Source: US Fish & Wildlife Service Last updated June 10, 2019
Wildland-Urban Interface

The zone of transition between unoccupied land and human development, and likely including communities that are within 0.5 miles of the zone. These wildland urban interface (WUI) lands and communities adjacent to and surrounded by wildlands are at risk of wildfires. CAL FIRE produced a statewide map to flag areas that could be considered WUI zones. The designation is dependent upon two data sets, U.S. Census Bureau (2000) Housing Unit density and USGS National Land Cover Data (NLCD).

Source: CalFIRE Last updated June 10, 2019
Williamson Act 2006

Jurisdiction: Alameda County, Contra Costa County, Marin County, Napa County, San Francisco, San Mateo County, Santa Clara County, Solano County, Sonoma County. Protection: The Williamson Act, also known as the California Land Conservation Act of 1965, enables local governments to enter into contracts with private landowners for the purpose of restricting specific parcels of land to agricultural or related open space use.  In return, landowners receive property tax assessments which are much lower than normal because they are based upon farming and open space uses as opposed to full market value. 

Source: California Department of Conservation Last updated June 10, 2019
Williamson Act properties

Williamson Act properties are enrolled in a California program providing property tax relief to owners of farmland and open space land in exchange for a ten-year agreement that the land will not be developed or otherwise converted to another use. The state payments to counties to support this program ceased in FY 2009; the decision to continue the program is being made on a county by county basis.

Source: Greenbelt Alliance Last updated June 10, 2019
Winters Agricultural Preserve Jurisdiction: Solano County Protection: Agricultural Reserve Overlay.
Yellow Larkspur

Jurisdiction: U.S. Fish & Wildlife Service, Alameda County, Contra Costa County. Protection: Yellow or golden larkspur is a perennial herb in the buttercup family. USFWS listed this species as endangered in 2000 and published a final critical habitat designation in 2003.

Source: U.S. Fish & Wildlife Service Last updated June 10, 2019