Download CGS/CDF Watersheds Maps and Data

​ During the early 1980s, under the provisions of Section 208 of the Federal Water Pollution Control Act, the Environmental Protection Agency (EPA) funded a number of water protection projects that involved the geologic mapping of sensitive watersheds along California's north coast. Since then, the California Department of Conservation, California Geological Survey (CGS) has been contracted by the California Department of Forestry and Fire Protection (CDF) to produce maps for parts of Mendocino, Humboldt, and Del Norte counties, and other selected watersheds throughout the state (see Watersheds Index Map).

Maps (PDF)

Tips for printing these maps

GIS Data

Request all PDFs and GIS data as one download (277 megabyte Zip file)​.​​

Note to GIS Users Concerning Publication DMG CD 99-002 1999

An error exists in the geomorphology export file "geomorph.e00" on the CD version of this data set. To allow this file to be imported into ArcGIS please follow these steps:

1. Copy the file to your hard drive.
2. Remove the read-only restriction. To do so, right-click on the file. Left-click on Properties. Under Attributes, click the Read-Only box to remove the check and click the Apply button.
3. Open the "geomorph.e00" file using an ASCII text editor. Search for "-3," and replace it with "-3." Save file. This will allow the file to import into ArcGIS.