The Potter Valley Project (PVP) diverts water from the Eel River through a tunnel and hydropower facility operated by PG&E. The water flows through the Potter Valley and into Lake Mendocino. Typically, the water supply condition, which establishes minimum instream flows in the Russian River, is determined by inflow into Lake Pillsbury, located upstream of the Potter Valley Project. But because the water imported from the Eel River into the Russian River will be greatly diminished due to the hydropower plant failure, there will be little to no correlation between cumulative inflow into Lake Pillsbury and the hydrologic conditions in the Russian River watershed.
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