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