“WET” Water Year: Trinity River Significant Water Release 8500cfs

Declaration of a “Wet” water year for 2025

Trinity River Restoration Program Water Year 2025 Spring Flow Release Notification

Lewiston, Calif. – Water releases from Lewiston Dam into the Trinity River are scheduled to begin significantly increasing on Monday, Apr. 15, 2025. Each year, the Trinity Management Council recommends a spring and summer flow schedule to the Regional Directors of the Bureau of Reclamation and Fish and Wildlife Service for approval. The recommendation is developed to benefit juvenile salmonid growth, adult salmon migration, riparian plant establishment and growth, and sediment mobilization in support of Tribal, commercial and recreational harvest of adult salmon in the Trinity River watershed.

The hydrograph developed is based on the California Department of Water Resources Bulletin 120 50% Exceedance Forecast declaration of a “Wet” water year for 2025, which sets the TRRP volume release at 701,000 acre feet for the water year. Releases from Oct. 1 through Apr. 15 were scheduled at 300,777 acre feet* leaving the restoration volume at 400,223 for the remainder of the water year. The flow schedule includes day-to-day flow variability, a key component of river systems that support salmon.

For the 2025 spring release, flows will peak at 8,500 cubic feet per second at noon on Apr. 16. After the peak a slow recession begins at 6 p.m, reaching 600 cubic feet per second on Jun. 30. Flows are scheduled to minimally rise again for two small peaks on Jul. 11 and again on Aug. 2 to help salmon migrate out of the lower portion of the river. Maximum Daily flow based on a “wet” water year designation is included below.

Please take appropriate precautions whenever on or near the river. Residents in the river corridor are advised to move items away from the riverbank before peak flows begin.

If you have questions, please contact the Trinity River Restoration Program office at 530-623-1800 or by emailing your question to [email protected]. An up-to-date daily schedule of flow releases are available at: http://www.trrp.net/restoration/flows/current/

*300,777af accounts for scheduled restoration flows between Oct. 15 through Apr. 15 and does not include reservoir management releases.

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