Welcome to the California Department of Conservation
CGS / Forest and Watershed Geology Program

Forest and Watershed Geology Program - 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 THE CGS FWGP WEB SITE,
YOU ACKNOWLEDGE YOU HAVE READ THE DISCLAIMER
ABOVE AND THAT YOU ACCEPT ITS CONDITIONS 

Maps Description Scale Download

North Coast Watershed Mapping CD cover


 North Coast Watersheds Mapping

 Contains sixty 7.5 minute quadrangles for parts of Mendocino, Humboldt, and  Del Norte counties.
 

1:24,000 

NORTH COAST WATERSHEDS

Maps Description Scale Download

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


 Noyo River Watershed

 Watershed Mapping Series, Map Set 1

  • 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
    		•

    1:24,000

    NOYO

    Maps Description Scale Download

    Jackson State Demonstration Forest Geologic and Geomorphic Features Map, color

     
     Jackson Demonstration State Forest

     Watershed Mapping Series, Map Set 2

  • 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
    		• 1:24,000

    JDSF

    Maps Description Scale Download

    Freshwater Creek Geologic and Geomorphic Features Map, color


     Freshwater Creek Watershed

     Watershed Mapping Series, Map Set 3

  • 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
    		•  1:24,000

    FRESHWATER

    Maps Description Scale Download

    Elk River Waterhed Geologic and Geomorphic map, Color


     Elk River Watershed

     Watershed Mapping Series, Map Set 4

  • 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
    		•

    1:24,000

    ELK

    Maps Description Scale Download

     

    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

  • 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
    		•

    1:24,000

    GUALALA

    Maps Description Scale Download

     

     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

  • 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
    		•

    1:24,000

    REDWOOD

    Maps Description Scale Download

    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

  • 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
    		•

    1:24,000

     MATTOLE

    Maps Description Scale Download

     

    Albion River Watershed Geologic and Geomorphic Map, color

     
     Albion River Watershed

     Watershed Mapping Series, Map Set 8

  • 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
    		•

    1:24,000

    ALBION
    ALBION ERRATA

    Maps Description Scale Download

     

     
     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
    		•

    1:24,000

    BIG