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

Recent scientific discoveries have validated the ancient knowledge that summer-run steelhead and spring chinook salmon are truly distinct from their ...
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The EcoNews crew with guests Darren Mierau of California Trout and Klamath dam campaign veteran Craig Tucker discussing the nascent plan to ...
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We’d really appreciate your help with a little project we’ve been working on: SCOTT DAM REMOVAL!!! As Friends of the ...
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For Release: Weds May 13, 2020 For more information: Alicia Hamann, Executive Director, alicia@eelriver.org Scott Greacen, Conservation Director, scott@eelriver.org Today’s ...
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An incredibly important paper by Friends of the Eel River's long-time colleague Samantha Kannry and others has just been released ...
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Friends of the Eel River has been evaluating the safety and reliability of Scott Dam for several years now. We ...
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