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

We’re encouraged by the progress we are making toward Eel River dam removal. PG&E seems eager to rid themselves of this liability-ridden project. It’s our job to make sure dam removal comes in time to save the Eel’s native fish ...
PG&E has released their initial draft decommissioning plan for the Potter Valley Project. The plan calls for removal of both Scott and Cape Horn Dams, and provides a few options for consideration by stakeholders. This initial draft does not include ...
PG&E PLANS TO REMOVE EEL RIVER DAMS IN 2028 Draft Surrender and Decommissioning Plan Offers Two Paths to Freeing the Eel - Soon to be California’s Longest Free-Flowing River Eureka, CA – For well over a century, Eel River dams ...
Congressman Jared Huffman joins the show to discuss the current happenings in Washington D.C. — Who the heck is Speaker Mike Johnson? Will we pass a continuing budget resolution? Why would any thinking person want to be a United States ...
On this week's episode of the EcoNews Report we reflect on the tragic dam failure in Libya last month and discuss why Scott Dam on the Eel River poses similar risks. The PG&E owned dam sits right on a significant ...
​On Sept. 12, storm Daniel overwhelmed two neglected dams in Libya. The flood washed away entire neighborhoods in the coastal city of Derna, killing thousands. Experts warned just last year that lack of maintenance risked failure of the dams, built ...