GIS Data Download

To access our web mapping applications, please visit our Web GIS.


The County of Humboldt makes no guarantee of the quality or completeness of this data. It has not been fully reviewed for accuracy and is intended to be used for planning purposes only. The department assumes no liability or responsibility in the use of this data. While every effort has been made to assure the accuracy of this information, it should be understood that it does not have the force and effect of law, rule, or regulation. In the event of any difference or error, the law will take precedence.

The accuracy of map data varies from location to location in the county. While the GIS is useful for planning purposes, it should not be relied upon to determine property, zoning or general plan designation boundaries or be used in any way for project design. All GIS data should be verified before it is materially relied upon for property or project planning. In urban areas the GIS map data maybe inaccurate by as much as 50 feet in any direction. In rural areas the map data may be inaccurate by as much as 400 feet in any direction.

Data Projection
GIS data is in CA State Plane Zone 1, UTM Zone 10, or Albers Equal Area projection coordinates. Most Humboldt County GIS data is in CA State Plane Zone 1 NAD27 Units Feet coordinates. Humboldt County is not the source for all data listed below. In some cases, data must be acquired from the original source. Web links are provided when available.

Please note the following:
  • Metadata is provided in *.met text file, html, or xml files
  • Downloads are compressed zip files consisting of all necessary files for each data set including projection files and metadata.
  • The links below represent the most recent available data.
  • Labels containing this ± symbol include data dependent on parcel lines.
Data Download
Frequently Requested Data Sets
Administrative Boundaries
  • Cal Fish and Wildlife Natural Diversity Database
Control / Survey Data
Fire Plan Data
  • Cal Fire Fuels: Fire Hazard Severity Zones (1985)
  • Cal Fire Fuels: Very High Fire Hazard Severity Zones (AB 337)
  • Cal Fire Historical Fires
  • Cal Fire State Responsibility Area
Hazard Disclosure
  • Cal Fire Blue Line Streams
  • Cal Fire Calwater Watersheds
  • Environmental Protection Agency (EPA) National Hydrography
Imagery & Aerial Photography
Land Ownership
Land Use
Roads / Transportation
  • Web Soil Survey, Natural Resources Conservation Service, United States Department of Agriculture (USDA)
  • Ten Meter Digital Elevation Model (DEM) Grids
  • CDF California Vegetation (CALVEG and WHR)
  • USGS Geographic Names Database (GNIS)
Contact Information
For any questions or to request data not listed on this page, please contact GIS Analyst Jerry von Dohlen via email or by calling 707-268-3776.