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Identification of the Instream Flow Requirements for Fall-Run Chinook Salmon Spawning in the Merced River
In response to substantial declines in anadromous fish populations, the Central Valley Project Improvement Act requires the doubling of the natural production of anadromous fish stocks, including the four races of chinook salmon (fall, late-fall, winter, and spring runs), steelhead, and white and green sturgeon. On the Merced River, the Central Valley Project Improvement Act Anadromous Restoration Plan calls for October and November (during fall-run chinook salmon and spawning) flows ranging rom 250 cfs in critically dry years to 350 cfs in wet years (U.S. Fish and Wildlife Service 1995). In December 1994, the U.S. Fish and Wildlife Service prepared a study proposal to identify the instream flow requirements for andromous fish in certain stream within the Central Valley of California, including the Merced River.
The purpose of this study is to produce a model predicting the availability of physical habitat in the Merced River over a range of streamflows for spawning fall-run Chinook salmon. The Physical Habitat Simulation component of the Instream Flow Incremental Methodology was used for this modeling. The results of this study are intended to supplement data collected by CDFG to produce comprehensive instream flow recommendations, to support or revise the flow recommendations above.
salmon spawning, instream flow investigation, fish restoration program, physical habitat model,
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Jeff Thomas, Chief Instream Flow Assessment Branch U.S. Fish and Wildlife Branch Ecological Services Sacramento Field Office 3310 El Camino Suite 130 Sacramento, CA 95821
Hatchery, Big Bull Flat, Red's Riffle, Barnowl Riffle, Robinson Riffle, Sodbuster Riffle, Bull Frog Riffles
Merced River
Merced County