Potter Valley Project

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About the Potter Valley Project

The Potter Valley Project is a small hydropower project in the headwaters of the Eel River. It consists of two dams, a mile-long diversion tunnel, and a powerhouse with a 9.4 mw capacity. The project is located in the Eel River headwaters and diverts water out of the watershed into the Russian River. Removing this project is the necessary first step to fisheries recovery on the Eel River. Learn more about dam impacts to fisheries habitat & flow, local economy, energy production, and downstream safety here.

Potter Valley Project map

Traveling upriver as the salmon do, Cape Horn Dam is the first structure. It was built in 1908, stands 96ft tall, and impounds the river to make the 700af Van Arsdale Reservoir. Cape Horn Dam is equipped with a fish ladder, although some migrating species like Lamprey still have a hard time with this obstacle. About 12 miles upstream is Scott Dam. It was built in 1922, stands 138ft tall, and creates the roughly 79,000af Lake Pillsbury Reservoir. Scott Dam lacks any fish passage, preventing migrating salmonids and other native species from accessing roughly 10% of the Eel River Watershed.

 

ScottDam_aerial_RB
Scott Dam impounds the river to form Lake Pillsbury Reservoir, all under the backdrop of Snow Mountain.
Cape Horn Dam impounds the Eel River to form Van Arsdale Reservoir. There is a fish ladder here where the Department of Fish and Wildlife conducts fish counts.

The Latest Eel River Dams News

“Many people know that the river’s name is the Eel River right now, but the original name is Wiyot, that’s ...
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We have great news for the Eel River and its fisheries. Days before entering bankruptcy, utility giant PG&E withdrew its ...
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(Eureka) Friends of the Eel River welcomes today’s announcement by PG&E that the utility is withdrawing its formal notice of ...
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From Pacific Gas and Electric: NOTICE OF WITHDRAWAL OF NOTICE OF INTENT TO FILE LICENSE APPLICATION AND PRE-APPLICATION DOCUMENT On ...
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FOER staff and Board spent a weekend in the Upper Eel river watershed in late November. Amidst the lingering smoke ...
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Friends of the Eel River submitted both federal ESA and CESA petitions to list Northern California Summer Steelhead as an ...
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