Watershed Maps and GIS Data

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A complete list of landslide maps and geologic maps by the California Geological Survey is also available.

Disclaimer:

The State of California and the Department of Conservation make no representations or warrantees regarding the accuracy of the data from which these maps were derived. Neither the State nor the Department shall be liable under any circumstances for any direct, indirect, special, incidental or consequential damages with respect to any claim by any user or any third party on account of or arising from the use of these maps.

The identification and location of landslide hazard areas are based on review of limited aerial photographs that are listed on each specific map. In most cases, only two sets of aerial photographs were used to construct the landslide and geomorphic features maps. Due to time constraints all available data were not necessarily reviewed and used in construction of these maps. The quality of data used is varied. The information depicted on the maps has been drawn as accurately as possible at 1:24,000 scale. The maps and reports provided on this web site are subject to change without notice, and the latest available versions will be posted on this web site.

Information on the maps are not sufficient to serve as a substitute for site specific geologic and geotechnical site investigations as required under the Chapters 7.5 and 7.8 of Division 2 of the Public Resources Code.

BY DOWNLOADING FILES FROM THIS WEB SITE, YOU ACKNOWLEDGE YOU HAVE READ THE DISCLAIMER ABOVE AND THAT YOU ACCEPT ITS CONDITIONS

 

Geologic Compilation of Quaternary Surficial Deposits in Southern California

  • Contains CGS Special Report 217 accompanied by a GIS digital database for 16 quadrangle maps covering parts of Southern California.
  • Scale 1:100,000

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North Coast Watershed Mapping CD cover 

North Coast Watersheds Mapping

  • CD 99-002
  • Contains sixty 7.5 minute quadrangles for parts of Mendocino, Humboldt, and Del Norte counties.
  • Scale 1:24,000

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Noyo River Watershed Geology and Geomorphic Features Map, Color east portion Noyo River Watershed Geologic and Geomorphic Features Map, Color west portion 

Noyo River Watershed

  • Watershed Mapping Series, Map Set 1, CD 2001-003
  • Map of Geologic and Geomorphic Features Related to Landsliding (color and black-and-white), Noyo River Watershed, Mendocino County, California
  • Landslide Potential Map with Geologic and Geomorphic Features, Noyo River Watershed, Mendocino County, California
  • Scale 1:24,000

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Jackson State Demonstration Forest Geologic and Geomorphic Features Map, color 

Jackson Demonstration State Forest

  • Watershed Mapping Series, Map Set 2, CD 2002-05: Jackson Demonstration State Forest
  • Preliminary Map of Geologic and Geomorphic Features Related to Landsliding (color and black-and-white), Jackson Demonstration State Forest, Mendocino County, California
  • Preliminary Landslide Potential Map with Geologic and Geomorphic Features, Jackson Demonstration State Forest, Mendocino County, California
  • Scale 1:24,000

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Freshwater Creek Geologic and Geomorphic Features Map, color 

Freshwater Creek Watershed

  • Watershed Mapping Series, Map Set 3, CD 2002-06
  • Digital Representation of OFR 99-10 and OFR 99-10a, Geologic and Geomorphic Features Related to Landsliding (color and black-and-white), Freshwater Creek, Humboldt County, California
  • Digital Representation of OFR 99-10 and OFR 99-10a, Relative Landslide Potential with Geologic and Geomorphic Features, Freshwater Creek, Humboldt County, California
  • Scale 1:24,000

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Elk River Waterhed Geologic and Geomorphic map, Color 

Elk River Watershed

  • Watershed Mapping Series, Map Set 4, CD 2005-01
  • Geologic and Geomorphic Features Related to Landsliding (color and black-and-white), Elk River Watershed, Humboldt County, California
  • Relative Landslide Potential with Geologic and Geomorphic Features, Elk River Watershed, Humboldt County, California
  • Scale 1:24,000

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Gualala River Watershed Geologic and Geomorphic Map,color Gualala River Watershed Geologic and Geomorphic Map,color Gualala River Watershed Geologic and Geomorphic Map,color 

Gualala River Watershed

  • Watershed Mapping Series, Map Set 5, CD 2002-08
  • Geologic and Geomorphic Features Related to Landsliding (color and black-and-white), Gualala River Watershed, Sonoma and Mendocino Counties, California
  • Relative Landslide Potential with Geologic and Geomorphic Features, Gualala River Watershed, Sonoma and Mendocino Counties, California
  • Potential Restoration Sites and Habitat Limiting Factors for the Gualala River Watershed, Sonoma and Mendocino Counties, California
  • Scale 1:24,000

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Redwood River Watershed Geologic and Geomorphic Map, color Redwood River Watershed Geologic and Geomorphic Map, color Redwood River Watershed Geologic and Geomorphic Map, color 

Redwood Creek Watershed

  • Watershed Mapping Series, Map Set 6, CD 2002-10
  • Geologic and Geomorphic Features Related to Landsliding (color and black-and-white), Redwood Creek Watershed, Humboldt County, California
  • Relative Landslide Potential with Geologic and Geomorphic Features, Redwood Creek Watershed, Humboldt County, California
  • Scale 1:24,000

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Mattole River Watershed Geologic and Geomorphic Map, color Mattole River Watershed Geologic and Geomorphic Map, color Mattole River Watershed Geologic and Geomorphic Map, color 

Mattole River Watershed

  • Watershed Mapping Series, Map Set 7, CD 2002-09
  • Geologic and Geomorphic Features Related to Landsliding (color and black-and-white), Mattole River Watershed, Humboldt and Mendocino Counties, California
  • Relative Landslide Potential with Geologic and Geomorphic Features, Mattole River Watershed, Humboldt and Mendocino Counties, California
  • Scale 1:24,000

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Albion River Watershed Geologic and Geomorphic Map, color 

Albion River Watershed

  • Watershed Mapping Series, Map Set 8, CD 2004-03
  • Geologic and Geomorphic Features Related to Landsliding (color and black-and-white), Albion River Watershed, Mendocino County, California
  • Relative Landslide Potential with Geologic and Geomorphic Features, Albion River Watershed, Mendocino County, California
  • Scale 1:24,000

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Big River Watershed

  • Watershed Mapping Series, Map Set 9
  • Geologic and Geomorphic Features Related to Landsliding (color and black-and-white), Big River Watershed, Mendocino County, California
  • Relative Landslide Potential with Geologic and Geomorphic Features, Big River Watershed, Mendocino County, California
  • Scale 1:24,000

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The Title 2 project encompassed coastal counties from the Oregon border to Santa Cruz. 

Title II Geologic Data Compilation Project

  • Geology and Landslides in Selected North Coast Quadrangles of Northern California
  • The project, known as the Title II Geologic Data Compilation Project, encompassed more than 70 topographic quadrangles from Del Norte County south to Santa Cruz County. Geologic and landslide data were compiled at a scale of either 1:62,500 (north of San Francisco) or 1:24,000 (south of San Francisco).
  • Scale 1:62,500 or 1:24,000

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