Trinity River Restoration


Construction of dams, diversion of water, and reduction of flows in the Trinity River have impacted the river’s ecology, its fisheries, and its ability to recover from prior mining activities. In addition to the dams blocking salmon from the upper watershed, studies during the 1980s and 1990s revealed that weak flows resulted in channel simplification and a reduction of habitat for juvenile salmon.

Photo by Kenneth DeCamp, purchased by the USBR Trinity River Restoration Program. Side channel at the Sawmill Rehabilitation site.

Side channel at the Sawmill Channel Rehabilitation site constructed in 2009. Photo by Kenneth DeCamp 

This page gives a broad overview of TRRP restoration; more details are given on pages for each of TRRP’s restoration activities.


The overall strategy of the Trinity River Flow Evaluation Final Report (TRFEFR) and the Trinity River Restoration Record of Decision (ROD) is to restore physical process and rescale the Trinity River as a foundation for fishery recovery.  The ROD established the current Trinity River Restoration Program (TRRP) and specifies:



Variable Flows

Channel Rehabilitation

Gravel Augmentation

Watershed/Sediment Control

Science and Adaptive Management