The following piece dives into the evolving debate over the Potter Valley Project. These two aging dams divert water from the Eel River into the Russian River system, and PG&E’s plan to decommission them is shaking up water policy from Marin County to Mendocino and Sonoma counties.
With FERC now weighing competing interests, Marin communities—from San Rafael and Mill Valley to Novato and Sausalito—are paying close attention. Environmental groups, farmers, and potential buyers are all tangled up in a high-stakes decision that could reshape regional water supply and salmon habitat.
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What is the Potter Valley Project and why it matters to Marin
Scott Dam and Cape Horn Dam make up the Potter Valley Project. They currently divert Eel River water into the Russian River system, which serves parts of Mendocino and Sonoma counties.
In July 2025, PG&E submitted a plan to decommission these century-old facilities. They argue the dams just aren’t economically viable anymore.
While full removal is the stated goal, PG&E hints that some water-moving infrastructure could be reused or handed off to other entities. The details seem a little fuzzy, though.
In Marin, these potential changes echo through ongoing discussions about regional water reliability and ecosystem restoration. Residents in cities like San Rafael, Corte Madera, and Fairfax are following the news, right alongside farmers in Sonoma and Napa counties who depend on these interconnected water systems for irrigation and daily life.
Current status and key players
The decision now sits with FERC. PG&E’s decommissioning plan triggered a joint proposal from a coalition that includes Sonoma Water, Mendocino’s Inland Water & Power Commission, the Round Valley Indian Tribes, Humboldt County, California Trout, Trout Unlimited, and the California Department of Fish and Wildlife.
Agriculture Secretary Brooke Rollins urged FERC to reject the plan, flagging a potential buyer—the Elsinore Valley Municipal Water District in Southern California. The Lake Elsinore district says it’s exploring options outside its service area, and USDA officials call the district a “legitimate buyer.”
Environmental and agricultural stakes
Dam removal supporters—mostly environmentalists and Eel River advocates—say restoring salmon access to the upper Eel watershed is crucial for ecological health and biodiversity. Local farmers and ranchers, though, warn that taking out the dams could threaten water supplies and the regional economy.
They’re pointing to the practical challenge of balancing habitat restoration with agricultural needs in Marin’s neighboring counties. PG&E has floated a compromise—the New Eel-Russian Facility—to keep some water transfers going after dam removal.
This plan tries to preserve critical conveyance while allowing for broader ecological restoration. It’s a middle-ground option, and farming communities in Sonoma and Mendocino counties are watching it closely as the legal and regulatory process drags on.
Local Marin angle: water planning from San Rafael to Sausalito
Marin County towns—from San Rafael to Mill Valley and Novato—rely on interlinked water systems and regional planning that stretch across county lines. The Potter Valley story hits home in Marin because upstream diversions can ripple into Bay Area water reliability, levee protection, and watershed management strategies.
These changes affect urban water departments, small farms, and local ecosystems. Communities in Tiburon, Larkspur, and Kentfield are part of bigger conversations about securing long-term supply while respecting salmon runs and habitat restoration in nearby streams—eventually impacting Marin’s creeks and reservoirs.
Expert perspectives and the science
UC Davis researchers have weighed in. They say rehabilitating the nearly century-old dams doesn’t make sense financially or logistically.
Decommissioning, in their view, is the most realistic path forward. They note the project’s water diversions make up a relatively small slice of California’s overall water picture.
Their analysis leans toward ecological restoration but also admits there’ll be ripple effects on local agriculture and water management across the North Bay, including Marin’s open space lands and agricultural preserves. It’s not a simple call, and the science doesn’t pretend otherwise.
What happens next: timeline and possible outcomes
The fate of the Potter Valley Project now hangs in the balance as FERC weighs decommissioning, potential buyers, and transfer proposals. Federal and local interests are all jostling for their say.
In Marin, civic leaders in San Anselmo, Fairfax, and across the North Bay want real transparency. They’re asking tough questions about how any decision might impact not just salmon and habitat, but also day-to-day water reliability for homes, schools, and businesses.
The next few weeks and months will bring regulatory reviews and a whirlwind of negotiations. There’ll be public comment periods too, and honestly, any of these could tip things toward dam removal and restoration—or maybe toward a new management deal if partners step up.
- Salmon habitat restoration and watershed recovery
- Water supply reliability for Marin communities and neighboring counties
- Economic impacts on North Bay agriculture and infrastructure
- Regulatory and political dynamics at FERC and among federal and state agencies
From Novato to San Rafael, everyone’s watching. The Potter Valley decision really shows how tangled up regional water policy is with ecology, the economy, and daily life for Marin folks who just want a reliable, well-managed water future.
Here is the source article for this story: Controversial PG&E dam removal plan draws Trump admin pushback
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