The fish were originally released as part of the San Joaquin River Restoration Program. But cooler, cleaner water and improved habitat conditions on the Tuolumne appeared to draw the fish off course, according to officials from the Turlock Irrigation District (TID).
The salmon became trapped below the historic La Grange Diversion Dam after spring flows receded, isolating them in a plunge pool with limited oxygen and rising temperatures. In response, TID worked alongside the California Department of Fish and Wildlife, U.S. Fish and Wildlife Service, NOAA Fisheries, and the fisheries consulting firm FISHBIO to safely relocate the fish downstream.
TID's construction team built a custom transport device, a chamber system designed to assist with fish relocation. Crews carried out five separate rescue missions after realizing just how many fish had gathered.
Officials say the salmon were likely drawn to the Tuolumne due to restoration work already underway. TID and its partners, Modesto Irrigation District and the San Francisco Public Utilities Commission, have spent years improving habitat along the river, including adding clean gravel, expanding floodplain access and enhancing flows to support native fish.
The final group of fish was relocated about 10 days ago. The Tuolumne River Partners say they plan to install a segregation weir near Old La Grange Bridge to help manage future runs and prevent spring-run salmon from becoming stranded again.
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