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“to restore and maintain the Trinity River’s anadromous fishery resources”
– U.S. Department of Interior, Record of Decision, 2000

Lewiston Old Bridge in the 1940 flood. Peak flow calculated by USGS was 40,300 cfs. Photograph by Boni DeCamp, provided by Kenneth DeCamp. Learn about flows on the Trinity River and the reason for restoration flow releases!
Alcove at Lower Steiner Flat channel rehabilitation site. Alcoves provide good habitat for young salmon in shallow water and woody debris provides safe sites from predators. Learn more about Channel Rehabilitation features here!
The reason for restoring ecological function to the Trinity River below the dams is to restore and maintain natural fish populations. Learn about how TRRP assesses progress.
TRRP assesses foothill yellow-legged frogs (Rana boylii) to determine the effects of restoration releases on breeding distribution, timing, and survival of egg masses. While colder water temperatures benefit fish, they may also present problems for this species’ egg survival. Read more about riparian and wildlife studies here!
Restoration flows perform many ecological functions. Read more about restoration flow releases here, or view the release recommendation data since 2001 here.
Deep pools are used as holding areas for returning adult salmon and steelhead, allowing the migrants a place to rest and avoid predators and temperature extremes. Read more about salmonid runs here!
TRRP fishery management partners collect outmigrating juvenile salmon in traps to assess the number of natural and hatchery juveniles that contribute to Trinity River returns. Learn about juvenile salmonid outmigration to the ocean here!
Hoadley Gulch side channel: Channel rehabilitation in 2008, photographed in 2014. This was one of the first side channels to have active spawning observed just days after completion! Learn more about Channel Rehabilitation here.
Juvenile salmonids are counted during snorkel surveys that help to assess the success of the primary goal of the Program: To restore and maintain the natural fishery of the Trinity River, downstream of the Lewiston Dam. Click here to learn more about juvenile salmonid habitat studies.
The Trinity River today has a long historical legacy. This image blends a 1950 photo of gold dredging near Lewiston with the same area as it is today. Click here to learn more of the background to current river restoration.
Adult steelhead migrate from a marine environment into the freshwater streams and rivers of their birth in order to mate (called anadromy). Unlike other Pacific salmonids, they can spawn more than one time.Learn more about spawning studies here!
Both Girl Scouts and Boy Scouts assisted revegetation by planting acorns at the Lorenz Gulch channel rehabilitation site. The flags mark the areas where acorns are planted, so that the survival of seedlings can be documented later. Learn more about TRRP revegetation here!
Chinook salmon are easily the largest of any salmon, with adults often exceeding 40 pounds (18 kg); individuals over 120 pounds (55 kg) have been reported. The Program collects data from spawning surveys to aid in the adaptive management process.

Latest Information

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General

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Flows

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For a recording of current conditions call: (530) 246-7594

Trinity River Current Flows

Hover with mouse for details - Click with mouse goes to the USGS NWIS page.

cubic feet per second (cfs)

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The table above contains provisional data provided by the USGS via the waterservices site. All data are provisional and may be recalculated before final approval. This table may take several seconds to load.


* = value 2+ hours old
** = 4 or more hours

Problems with this table may be reported to the TRRP Data Steward.