Trinity River Watershed Management Area
Hydrologic Units: Trinity River
Description: The Trinity River is the largest tributary to the Klamath River; the basin drains a mountainous terrain of about 2,900 square miles. The U.S. Forest Service and the Bureau of Land Management manage approximately 80 percent of the Trinity WMA. About half of the remaining 20 percent is managed as industrial timberland or for cattle grazing.
The watershed is mostly rural with the population centered in the towns of Trinity Center, Weaverville, Lewiston, Hayfork, and Hyampom. In the early 1950s, two major water-development features were constructed above river-mile 112. Lewiston Dam and its reservoir and Trinity Dam and its reservoir (Trinity Lake) are collectively known as the Trinity River Diversion (TRD). The TRD diverts a majority of the upper-basin’s water at the town of Lewiston for power generation and to support the US Bureau of Reclamation’s Central Valley Project.
Watershed Plans can be easily accessed on the right side of this page and in the linked library folder (Library > Watershed Management Plans > Trinity River Watershed Management Area).
Watershed Groups: Please follow these instructions to publish your group information
- Trinity River Adaptive Management Working Group
- Trinity River Fisheries Task Force
- Trinity Management Council
Salmonids: Chinook salmon (Oncorhynchus tshawytscha), coho salmon (Oncorhynchus kisutch) and steelhead trout (Oncorhynchus mykiss)
