Forest Practice Geographical Information System (GIS)

CAL FIRE's Forest Practice Geographical Information System (GIS) captures current and historic timber harvesting activities for over 4 million acres of California timberland. Silviculture, yarding, new road construction, watercourse classifications, and timberland conversions are tracked through the GIS. Once in the GIS, this information can be graphically represented on maps, can be brought into Google Earth, or used in your own GIS system. The GIS data is available for land-use planning, the analyses of cumulative impacts, and to meet the requirements of California's Forest Practice Rules.

Timber harvesting data in ESRI and Google Earth formats along with geo-referenced THP maps are available for download at

For those without access to GIS but in need of watershed mapping, the Forest Practice Watershed Mapper is a web-based mapping application that allows users to identify the status of a specific planning watershed regarding anadromous salmonids, 303.d waterbodies, Forest Districts, and average rainfall, all in the context of past and present timber harvesting activities. Microsoft Silverlight, a free plug-in, is required to operate the Forest Practice Watershed Mapper. If not already installed on your computer, you will be prompted to install it. Follow the steps, and the Mapper will load. Access the Mapper at

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