American River Basin Stormwater Resource Plan Web Map - Help
OWP at Sacramento State developed this web map to assist in identifying project opportunities for the American River Basin (ARB) Stormwater Resource Plans (SWRP).
This is a web-based GIS map providing layers of multiple surface, subsurface, environmental, and community characteristics for eastern Sacramento county, western Placer county,
and the surrounding regions.
Layer Descriptions
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303(d) List & TMDLs (SWRCB) – This layer contains water bodies that either have a Total Maximum Daily Load (TMDL) or are on the 2014-16 303(d) list of impaired water bodies
developed by the California State Water Resources Control Board (SWRCB). The original GIS files are from the SWRCB, but many of the water body extents have been updated by OWP
at Sacramento State as appropriate.
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ARB Boundary – The American River Basin (ARB) boundaries encompass the watersheds associated with the existing ARB Integrated Regional Water Management Plan (IRWMP).
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Cities (2010 Census) – This layer shows cities as defined by the 2010 US Census.
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Conservation Easements (GreenInfo Network) – California Conservation Easement Database (CCED) "contains data about lands that are under conservation or open space easement
(as opposed to those in CPAD that are owned outright “in fee”). Easements lands are typically private property and are only rarely open to the public (some easements overlay
publicly-owned lands, however)." CCED is maintained by GreenInfo Network, a nonprofit technology support organization founded in 1996.
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Counties – California county boundaries.
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Critical Habitat (USFWS) – FWS Critical Habitat for Threatened and Endangered Species Dataset. "When a species is proposed for listing as endangered or threatened under the Endangered Species Act, the U.S. Fish and Wildlife
Service 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 is a term defined and used in
the Act. It is a specific geographic area(s) that contains features essential for the conservation of a threatened or endangered species and that may require special management and protection. Critical habitat may include
an area that is not currently occupied by the species but that will be needed for its recovery. An area is designated as critical habitat after the Service publishes a proposed federal regulation in the Federal Register
and receives and considers public comments on the proposal. The final boundaries of the critical habitat are also published in the Federal Register."
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Disadvantaged Communities (CalEPA) – Disadvantaged communities are defined by the CalEPA as communities with scores in the top 75% percentile of CalEnviroScreen 3.0. CalEnviroScreen 3.0 is a screening tool created by the
California Office of Environmental Health Hazard Assessment to help identify communities disproportionately burdened by multiple sources of pollution and with population characteristics that make them more sensitive to pollution.
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Disadvantaged Communities (DWR) – Disadvantaged communities (DACs) are areas in which the median household income (MHI) is less than 60% of the MHI. Severely disadvantaged
communities are areas in which the median household income (MHI) is less than 80% of the MHI. The California Department of Water Resources (DWR) developed this layer using 2010
US Census data. “The Department of Water Resources (DWR) has developed a web-based application to assist local agencies and other interested parties in evaluating Economically
Distressed Area (EDA) status throughout the State, using the definition specified under the Water Quality, Supply, and Infrastructure Improvement Act of 2014 (Proposition 1)
Economically Distressed Area Instructions.”
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Depth to Groundwater (DWR) – The California Department of Water Resources (DWR) maintains the Groundwater Information Center (GWIC) Interactive Map Application, which includes
depth to groundwater below the ground surface. This layer "shows the depth to groundwater below the ground surface. Depth information is represented in feet below the ground surface.
Increasing values indicate increasing depth to groundwater (or deeper/lower water levels)."
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EnviroStor (DTSC) – "EnviroStor is the Department of Toxic Substances Control's data management system for tracking our cleanup, permitting, enforcement and investigation efforts at
hazardous waste facilities and sites with known contamination or sites where there may be reasons to investigate further."
The EnviroStor data was downloaded in June 2017. Check with the EnviroStor site for updates.
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Geology-Slope Zones (OWP) – Geology-Slope Zones (GSZ) are regions with different hydrologic (overland flow, groundwater recharge, etc.) and hillslope (sheetwash, rilling and gullying, etc.)
processes. OWP at Sacramento State divided the ARB region into four geologic units based on lithology and potential to recharge groundwater. Each of these units is further subdivided into three slope categories.
These twelve combinations create the GSZs for the region.
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GeoTracker (SWRCB) – "GeoTracker is the Water Boards' data management system for sites that impact, or have the potential to impact, water quality in California, with emphasis on groundwater.
GeoTracker contains records for sites that require cleanup, such as Leaking Underground Storage Tank (LUST) Sites, Department of Defense Sites, and Cleanup Program Sites. GeoTracker also contains
records for various unregulated projects as well as permitted facilities including: Irrigated Lands, Oil and Gas production, operating Permitted USTs, and Land Disposal Sites."
The GeoTracker data was downloaded in June 2017. Check with the GeoTracker site for updates.
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Land Cover (USGS) – The United State Geological Survey (USGS) maintains the National Land Cover Database (NLCD) to assist local, state, and federal managers and officials with
issues such as assessing ecosystem status and health, modeling nutrient and pesticide runoff, understanding spatial patterns of biodiversity, land use planning, deriving landscape
pattern metrics, and developing land management policies.
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Open Space, Parks, & Protected Lands (SACOG) – The Sacramento Area Council of Governments maintains a regional parks and open space database, which “is a working document that
inventories the open space, parks and protected lands in the SACOG region. Developed for Valley Vision and the region Open Space Project, this dataset depicts easement features as
well as other lands held under lease or some other management agreement, as submitted by major public, trust, and non-profit groups in the state.”
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Protected Areas (GreenInfo Network) – "The California Protected Areas Database contains data about lands that are owned outright (“in fee”) and protected for open space purposes by 1,100 public agencies or non-profit organizations.
CPAD lands range from the smallest urban pocket parks all the way to the largest wilderness areas – all told, CPAD inventories just over 49.2 million acres in 14,700 “parks” (known in CPAD as Super Units).
CPAD is published by GreenInfo Network, a nonprofit technology support organization founded in 1996."
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Public Schools (SACOG) – This is a database of schools in the region created by SACOG in 2010.
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Slope (USGS) – OWP at Sacramento State derived percent slopes of the ground surface from 1/3 arc second digital elevation data from the United State Geological Survey (USGS)
3D Elevation Program.
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Soil Details – This layer contains soil information that is useful for compliance with the CGP. Click on a soil to get soil information that includes: Compaction, Hydrologic Group,
Sand/Silt/Clay Percentages, Bulk Density, Soil Erosion Factors, and Ksat. Soils tend to vary in their extent and compositions. All values should be verified by on-site checks.
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Soil Hydrologic Group (NRCS) – The soil hydrologic group is a classification of a soil’s ability to infiltrate water. Soils are classified as A, B, C, or D. A-type soils infiltrate water quickly and D-type soils infiltrate water slowly.
The Natural Resource Conservation Service determines a soil’s group classification on the least transmissive layer in a soil. The table shows typical infiltration rates associated with each hydrologic group.
Soil Hydrologic
Group |
Typical Saturated
Hydraulic Conductivity
(in/hr) |
Saturated
Hydraulic Conductivity
Range (in/hr) |
| A |
1.5 |
5.67 - 1.42 |
| B |
1 |
1.42 - 0.57 |
| C |
0.32 |
0.57 - 0.06 |
| D |
0.03 |
0.06 - 0.01 |
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Storm Drains (Regional Municipalities) – Storm drain infrastructure (if provided) for various communities in the ARB region.
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Topographic Maps (USGS) – Topographic maps developed by the United States Geological Survey (USGS). The USGS database is hosted by the Environmental System Research Institute (ESRI).
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Watersheds HUC8 (USGS) – This layer shows Watershed Boundary Dataset (WBD) hydrologic unit code 8 (HUC8) watersheds.
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Wetlands – The California Aquatic Resources Inventory (CARI) is a Geographic Information System dataset of wetlands, streams, and riparian areas created by the San Francisco Estuary Institute (SFEI).
This data was processed to show only wetlands and riparian areas in the ARB region.
Change Log
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June 2017 - Beta test began
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January 2018 - Added: Disadvantaged Communities (CalEPA), Public Schools, and Wetlands layers
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April 2018 - Added: Potential Infiltration and Geology-Slope Zone Layers
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June 2018 - Updated the ARB Boundary and the 303(d) List
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October 2019 - Replaced the Potential Infiltration layer with Soil Details