Thermal imagery taken by drone illustrating temperatures of a field with a sprinkler and building was used at a recent outreach event to illustrate temperature diversity. *[TRRP/Elliot Sarnacki]*

Current Conditions | Stay up to date on conditions in the basin
Program Updates | Special TMC Meeting – Limiting Factors Analysis
Upcoming Meetings and Events
Reading, Listening & Watching

Current Conditions

Fall Monitoring | Annual Spawning and Carcass Surveys

Spawning surveys in the Trinity River kicked off the week of Sept. 7 with a survey in Reach 1 [Lewiston Dam to Bucktail]. Through three weeks of monitoring crews have observed 10 redds in Reaches 1-3, and one female Chinook salmon carcass in Reach 9.

Season Schedule

Lewiston-North Fork (reaches 1-7)
- Surveyed weekly
Big Flat-Cedar Flat (reaches 9-10) and Hawkins Bar-Weitchpec (reaches 12-14)
- Surveyed on alternating weeks

Link to weekly reports

Fall Monitoring | Lower Trinity Weir

The lower Trinity River weir, located near the Tish Tang Campground was installed the first week of September and began monitoring for fall run chinook, steelhead and coho to provide run-size estimates for adult salmonids and to monitor fish health by trapping, counting and performing fish health assessments.

Annual adult monitoring efforts have been consolidated into one location in the lower river and are implemented collaboratively by the California Department of Fish and Wildlife and the Hoopa Valley Tribe, funded by the Bureau of Reclamation. Trapping efforts will continue through the fall and wrap up, likely mid-November.

Please email info@trrp.net to receive seasonal trapping reports from the Upper and Lower Trinity Weir sites.

Fall Monitoring | Upper Trinity Weir

The Upper Trinity Weir, located just upriver of the Evan’s Bar boat launch began monitoring for adult salmonids on June 2. The upper weir monitors for annual runs of chinook, steelhead and coho to provide run-size estimates for adult salmonids and to monitor fish health by trapping, counting and performing fish health assessments.

The weir is run collaboratively by the California Department of Fish and Wildlife and the Hoopa Valley and Yurok Tribes with funding from the Bureau of Reclamation. The installation of the weir and day to day operations are collaboratively handled by CDFW & Hoopa Valley Tribal Fisheries. The Yurok Tribal Fisheries Department collaboratively operates the the Coho natural origin brood stock collection, which begins in October.

Please email info@trrp.net to receive seasonal trapping reports from the Upper and Lower Trinity Weir sites.

Trinity Reservoir | Conditions

Trinity Reservoir is at 70% capacity and 111% Historical average for this date. The 2027 Water Year begins on October 1.

Check Trinity Reservoir Storage Conditions | CDWR

Channel Rehabilitation | Sawmill Rehabilitation Update

The Yurok Tribe Construction Corporation completed civil construction at the Sawmill Gravel Processing Site Channel Rehabilitation Project mid-September. Hoopa Valley Fisheries Department re-vegetation crews remain at work and re-vegetation will continue until complete. Project Page

Flow Management | 2027 Water Year General Timeline

On Sept. 24, the Trinity Management Council voted to recommend Environmental Flow Management for the 2027 Water Year. Summer baseflow (450 cfs) will continue until Oct. 15 when reservoir operations drop flows to winter baseflow (300 cfs).

Oct. 15 – Dec. 14 | 300 CFS Baseflow
Dec. 15 – Feb. 14 | Synchronized Storm Pulse Period
Feb. 15 – Apr. 14 | Wet-Season Flood Period
Apr. 15 – Variable | Snow Melt Peak & Recession
Variable – Oct. 14 | 450 CFS Baseflow

Program Update

Special TMC Meeting | Limiting Factors Analysis

The Limiting Factors Analysis presented at the Special TMC Meeting in August offered critical insights into the challenges facing Chinook salmon recovery in the Trinity River system. By highlighting the most impactful limiting factors the analysis provides a roadmap for coordinated restoration and adaptive management. Continue Reading

Upcoming Meetings and Events

For a full list of events, click to view the TRRP Calendar.

October 3, 10-4 p.m. | Salmon Meets Harvest Festival

Highland Art Center Meadow – Weaverville, Ca.

Oct. 28, 6 p.m.| Science on Tap

The Trinity River is constantly changing. From managed flow releases to natural disturbances, how do scientists understand how these changes influence river ecosystems? Together we’ll look under the river’s surface, where tiny aquatic insects live, feed, and support the food web that sustains young salmon. By studying these organisms, scientists can gain valuable insights into how changing river conditions shape aquatic communities and the food web that supports juvenile salmon. Event Details