Trinity River Restoration Program

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Trinity River Restoration Program Restoring fisheries by restoring the river itself.

Flow Management | 2027 Water Year General TimelineOct. 15 – Dec. 14 | 300 CFS BaseflowDec. 15 – Feb. 14 | Synchronized S...
10/13/2026

Flow Management | 2027 Water Year General Timeline

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

On Sept. 24, the Trinity Management Council concurred with the recommendation of the TRRP Flow Workgroup to implement environmental flows for the 2027 Water Year, which include the winter flow project ruleset. The recommendation will be sent to representatives to the Department of Interior for final approval.

Although the river is always changing, Trinity River enthusiasts can expect Lewiston dam operations of summer baseflow (450 cfs) to continue until Oct. 15 when operations drop flows to winter baseflow (300 cfs).

To subscribe to receive Lewiston Dam change order notifications, please follow this link: http://groups.google.com/group/trinity-releases/boxsubscribe

Channel Rehabilitation Update | Sawmill Gravel Processing SiteThe Yurok Tribe Construction Corporation completed civil c...
10/09/2026

Channel Rehabilitation Update | Sawmill Gravel Processing Site

The Yurok Tribe Construction Corporation completed civil construction at the Sawmill Gravel Processing Site Channel Rehabilitation Project the week of September 21. Hoopa Valley Fisheries Department re-vegetation crews remain on-site to jumpstart the re-growth of native grasses, sedges, shrubs and trees in constructed areas.

https://www.trrp.net/phaseii-rehab-sawmill/

📸1: Photo compilation of aerial satellite imagery of the Trinity River at Sawmill in 1944, 1960, and 1971. These photos demonstrate dredger mining waste in riparian areas [1944], how the 1955 flood redistributed some mining tailings in riparian areas [1960], yet by 1971 the riparian berm built by consistent dam releases caused vegetation to block riparian habitat from the river's flow further channelizing the main path of the Trinity River.
📸2: Aerial image of the Sawmill restoration area on Sept. 25, 2026, just one day post completion of civil construction. Revegetation resumes the week of Sept. 28. [TRRP/Elliot Sarnacki]

Klamath Fish Health Assessment Team | Report UpdateConditions seem to be on a steady path to improvement as day lengths ...
10/06/2026

Klamath Fish Health Assessment Team | Report Update

Conditions seem to be on a steady path to improvement as day lengths get shorter and daytime temps continue to cool. Major concerns in late August with Ich (primarily in the lower Trinity River) have abated, potentially due to the increased flow releases from Lewiston Dam (see photo 2 for HVTF staff observed infections). Overall, incoming adult fall Chinook have made their most substantial migratory push in the first half of September. After Sept. 13, the recreational fishery on the lower Klamath implemented the adult Chinook closure.

These trends generally mark the wind down of the KFHAT “season”. The assessment team will continue to carry out bi-weekly meetings until the bulk of reporting sectors are “Green”.

📸1: Screenshot of the KFHAT map which presents the readiness level for the Klamath Basin below Iron Gate Dam in a visual format.

📸2: Figure 1 from KFHAT 2026 Week 12 Report. Ichthyoptherius multifilis infection rates observed on Hoopa Valley Tribe Reservation tribal harvested Chinook Salmon.

Fall Monitoring | Annual Spawning and Carcass SurveysSpawning surveys in the Trinity River kicked off the week of Aug. 3...
10/02/2026

Fall Monitoring | Annual Spawning and Carcass Surveys

Spawning surveys in the Trinity River kicked off the week of Aug. 31. No redds or carcasses were observed in the first week. The first three redds of the season were observed Week 2 in Reach 1 (Lewiston Dam - Bucktail). Through four weeks of monitoring crews have observed 68 redds in Reaches 1-7, and two successfully spawned female Chinook Salmon carcasses.

To view updates from Fish and Wildlife Service follow this link:
https://www.fws.gov/library/collections/arcata-fac-salmon-spawning-survey-data-klamath-and-trinity-rivers

Check out the Trinity River Restoration Program Newsletter, The River Riffle - September Edition: https://www.trrp.net/r...
09/29/2026

Check out the Trinity River Restoration Program Newsletter, The River Riffle - September Edition: https://www.trrp.net/river-riffle-newsletter-sept26/

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

To subscribe to future newsletters via email follow this link: https://groups.google.com/g/trrp_updates

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

The Trinity Management Council will meet Wednesday (9/23) and Thursday (9/24) in Weaverville, Ca. and virtually via Micr...
09/23/2026

The Trinity Management Council will meet Wednesday (9/23) and Thursday (9/24) in Weaverville, Ca. and virtually via Microsoft Teams for its final quarter meeting of the 2026 fiscal year. Wednesday's schedule of presentations is noted below! Note that the agenda is draft until the day of the meeting and the order of topics may change.

Wednesday Morning:
-Executive Director's Report (TRRP Staff)
-Central Valley Operations Update (Elizabeth Hadley, USBR)
-Trinity River Division Long Term Operations Consultation Update (Kristin Hiatt, USBR)

After Lunch:
-Trinity River Hatchery Update (Derek Rupert, USBR)
-Functional river attributes (Eric Peterson, TRRP)
-Juvenile salmonid survival study (Chad Martel, HVFD)
-Evans Bar Channel Rehabilitation Project 60% design (Jutin LaNier, CDWR)

Download the agenda for the Microsoft Teams Meeting details by following this link: https://www.trrp.net/calendar/event/?id=11902

We're hiring a lead physical scientist for hydrology & geomorphology who will work with our Science Branch team. This po...
09/22/2026

We're hiring a lead physical scientist for hydrology & geomorphology who will work with our Science Branch team. This position Involves managing technical studies, integrating results into program guidance, and providing scientific & design input for restoration projects such as flow releases, bank work, gravel augmentation, riparian & floodplain restoration, sediment management, and watershed improvements.

Apply by October 1, 2026

This announcement is open to U.S. Citizens or Nationals; and Career transition eligibles (CTAP, ICTAP, RPL). Position Details: https://www.usajobs.gov/job/884702700

It was an honor to take part in the Hoopa Valley Tribe and California Department of Fish and Wildlife ribbon cutting cer...
09/15/2026

It was an honor to take part in the Hoopa Valley Tribe and California Department of Fish and Wildlife ribbon cutting ceremony this past Tuesday. Our Executive Director, Mike Dixon joined CDFW Director Meghan Hertel, Hoopa Valley Tribal Chairman Joe Davis, Elizabeth Hadley Reclamation's Area Manager for the Northern California Area Office, along with other state and Tribal officials to officially dedicate and celebrate a new, jointly operated fish weir on the Lower Trinity River.

The consolidation of two weirs into one signals a new era of cooperation between partners vested in monitoring and improving the health of our Trinity River salmon. Prior to the construction of the new weir, CDFW and the Hoopa Valley Tribe each operated separate weirs on different parts of the river. The consolidated weir located on the Hoopa Valley Reservation will operate to temporarily contain fish for both scientific examination and selective tribal harvest.

Partnership and cooperation were top of mind for our Executive Director when he addressed the crowd, "partnerships form the basis for success within the Trinity River Restoration Program and today we honor CDFW and the Hoopa Valley Tribe's commitment to fish health and their dedication to the partnerships that work toward a healthier Trinity River."

Dixon honored two managers from each agency, Mike Orcutt, Fisheries Director for the Hoopa Valley Tribe Fisheries Department and Brett Kormos Program Manager for the California Department of Fish and Wildlife. Each persisted, communicated, compromised and were pivotal in making this consolidation possible.

See the news releases here:

CDFW & Hoopa Valley Tribe: https://wildlife.ca.gov/News/Archive/hoopa-valley-tribe-and-california-department-of-fish-and-wildlife-announce-historic-fishery-restoration-partnership

Reclamation: https://mavensnotebook.com/2026/09/09/usbr-trinity-river-weir-consolidation-streamlines-salmon-monitoring-and-opens-new-chapter-for-tribal-partnership/

Address

1615 Main Street, Unit J
Weaverville, CA
96093

Opening Hours

Monday 9am - 4pm
Tuesday 9am - 4pm
Wednesday 9am - 4pm
Thursday 9am - 4pm
Friday 9am - 4pm

Telephone

+15306231800

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