Nez Perce MOA On Dworshak Water Helps Keep Clearwater, Lower Snake  River Cool In September For Migrating, Over-Wintering Salmon, Steelhead

Throughout the summer, the U.S. Army Corps of Engineers has been using the cool water from deep within the Dworshak Reservoir to maintain a maximum 68-degree Fahrenheit tailwater temperature at Lower Granite Dam on the lower Snake River. Temperatures higher than 68 degrees can be lethal to both adult and juvenile salmonids migrating in the river, including endangered Snake River sockeye salmon arriving in late July and early August.

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