[env-trinity] Trinity River Restoration Program Water Year 2026 Spring Flow Release Notification

[Abel, Jennifer K]

 [https://groups.google.com/group/trinity-releases/attach/9b24d7b40041f/image.png?part=0.0.1&view=1]

For Release: April 13, 2026
Contact: Kiana Abel, 530-623-1804, jennifer_abel at ios.doi.gov

Trinity River Restoration Program Water Year 2026 Spring Flow Release Notification

Lewiston, Calif. – The 2026 water year hydrograph is pending final approval by the U.S. Department of the Interior. If the recommended hydrograph is approved, flows will pulse variably from Lewiston Dam staring April 15, 2026. The spring snow-melt peak will reach 4,300 cubic feet per second on Friday, April 24. After the peak, a slow recession declines to 750 cubic feet per second on June 9. Flows are scheduled to pulse up to 1450 cubic feet per second on June 15 then slowly decline to 450 cubic feet per second baseflow by July 3.

A chart outlining the Environmental Flow Schedule for Water Year 2026, including the recommended schedule after Apr. 15 is included below.

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<https://cdec.water.ca.gov/reportapp/javareports?name=B120DIST&utm_medium=email&utm_source=govdelivery> declaration of a “Dry” water year for 2026, which sets the TRRP volume release at 453,000 acre feet for October 1, 2025 through September 30, 2026. The flow schedule includes day-to-day flow variability, a key component of river systems that support salmon.

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 info at trrp.net. An up-to-date daily reading of river flows at several locations on the Trinity River are available at: http://www.trrp.net/restoration/flows/current/

If you would like to sign up for Lewiston Dam change order notifications, please follow this link: http://groups.google.com/group/trinity-releases/boxsubscribe

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Kiana Abel
Public Affairs Specialist | Trinity River Restoration Program<http://www.trrp.net/> | U.S. Bureau of Reclamation<https://www.usbr.gov/>
1313 S. Main St., Weaverville, CA 96093-1300 | 530-623-1804 (desk) | 530-739-9761 (cell) | jennifer_abel at ios.doi.gov
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