Lake Pillsbury – Enviro Updates

‘Surprise’ drop in Lake Pillsbury water release stokes fears

August 21, 2025

Amie Windsor, PRESS DEMOCRAT

A planned-for reduction in the amount of water Pacific Gas & Electric Co. is releasing from Lake Pillsbury caught Potter Valley farmers and ranchers off guard earlier this month during a key point in the summer growing and ranching season.

PG&E says stakeholders should have been expecting the dip in water pressure, which occurred on Aug. 5. But Janet Pauli, a rancher who is president of the Potter Valley Irrigation District board, says the utility failed to communicate about the change, which had been quietly approved by the Federal Energy Regulatory Commission.

“Did we anticipate it? Yeah. But until FERC granted it, there was no reason for us to change what we were doing. Instead of giving us a ‘heads up,’ PG&E dropped their flows extremely rapidly,” Pauli said. “It was a surprise, and for a little while it was a problem.”

As the Potter Valley agricultural community panicked over keeping cattle and crops sated, rumors erupted on social media that PG&E had begun cutting off the water supply from Scott Dam in advance of the structure being torn down as part of the decommissioning of PG&E’s Potter Valley Project, which includes a shuttered hydroelectric power plant.

Agriculture/Food System, WaterLake Pillsbury, PG&E, Potter Valley Project, water diversion

A to-be-drained lake, a PG&E plan, and the promise and peril of California’s next big dam removal

June 28, 2025

Amie Windsor, PRESS DEMOCRAT

LAKE PILLSBURY — A cool May breeze lapped across the surface of this reservoir in remote Lake County, where a couple made their way out in a boat across otherwise serene waters, taking advantage of the brightest bit of afternoon sun.

This man-made retreat, four square miles of water impounded by a dam across the upper Eel River, feels durable. It’s filled with hungry trout and black bullhead, prey for the sharp-eyed bald eagles, egrets and herons that hunt these waters.

To many of its visitors, and the several hundred people who live along its 31-mile shoreline deep within the sprawling Mendocino National Forest, Lake Pillsbury is the region’s heartbeat.

But Scott Dam, at the foot of Lake Pillsbury, and another, smaller dam on the river 12 miles downstream, have also become a headache for Pacific Gas & Electric Co., which owns both dams.

And that’s creating a controversy that’s drawn interest from everyone from those who live on Lake Pillsbury, to North Bay communities whose water supplies are linked to both dams, to federal agencies now under control of President Donald Trump.

Water, WildlifeEel River, endangered species, Lake Pillsbury, PG&E, Russian River, salmon, Scott Dam, water diversion

Op-Ed: A seismic threat to Scott Dam

April 14, 2025

Bob Schneider & Chad Roberts, PRESS DEMOCRAT

The earthquake risk at Scott Dam may be a key factor in PG&E’s decision to abandon the Potter Valley Project.

PG&E is surrendering its license for the Potter Valley Project, two dams that divert water from the Eel River to the Russian River while generating hydropower. PG&E identifies this as a business decision, because of the project’s failure to produce revenues that offset operating costs, even though the utility’s customers pay higher rates than just about everywhere else in the United States.

In our opinion, PG&E has determined to rid itself of the Potter Valley Project for a different kind of economic consideration, after determining that the Scott Dam represents an economic liability that the company cannot afford.

A key factor is the increased understanding of seismic hazards represented by the Bartlett Springs Fault Zone, which runs through Lake Pillsbury approximately 5,000 feet east of Scott Dam.

As part of the relicensing process, the Federal Energy Regulatory Commission held an auction for potential alternative licensees for the Potter Valley Project. No one made an offer, probably for the same reason PG&E doesn’t want the dams anymore: no potential owner wanted responsibility for the risk posed by the Bartlett Springs Fault.

Waterearthquake danger, Lake Pillsbury, Potter Valley Project, Scott Dam

Op-Ed: Saving rainwater for sunny days to come

April 17, 2024

Grant Davis, PRESS DEMOCRAT

The current water year, which began Oct. 1, has been wetter than usual, with the Russian River watershed accumulating 119% of the yearly average rainfall, totaling 49.38 inches since October.

In the past, we might have celebrated our good fortune and watched lake levels rise only to watch much of it sent downriver to the Pacific Ocean as reservoirs reached an inflexible upper threshold. Today, we get to continue enjoying that ample rainfall long after summer sunshine arrives.
Empty
Grant Davis

With almost a decade of data under its belt, the Russian River Forecast-Informed Reservoir Operations program has been making great strides by demonstrating the viability of this strategy to operate reservoirs more effectively using modern technology and forecasting.

This year, we expect the new method to ensure an additional 19,000 acre-feet of water in the Lake Sonoma reservoir heading into the summer, just as it did last year, thanks to our ability to leverage weather forecasting techniques and adapt how we manage our reservoirs. Add to that another 9,000 acre-feet stored in Lake Mendocino. An acre-foot equates to 325,851 gallons.

That 28,000 acre-feet represents a substantial savings, or almost 65% of Sonoma Water’s annual demand, given that the agency is projecting its three-year average annual water sales to be just under 43,000 acre-feet.

Waterdrought, flooding, Lake Mendocino, Lake Pillsbury, Lake Sonoma, water supply, weather forecasts

PG&E formalizes plan to take down dams on Eel River

November 17, 2023

Mary Callahan, PRESS DEMOCRAT

In a landmark moment, Pacific Gas & Electric Co. formalized its plans to tear down two more-than-century-old dams on the Eel River — removing the barrier that forms Lake Pillsbury, freeing the waters of the river and restoring the lake footprint to a more natural state.

The moves are part of a 94-page draft surrender application submitted to federal regulators and made public Friday as part of the utility’s plan to decommission its Potter Valley powerhouse and all the infrastructure that comes with it — including Scott and Cape Horn dams, sited slightly downstream.

PG&E has said work deconstructing the dams could begin as early 2028, depending on regulatory approval and environmental review of the plan.

Scott Dam, built in 1921, would come down first, either in phases or all in one season.

Pacific Gas & Electric Co. initial draft plan

The plan fulfills long-held dreams of conservationists and fishery groups to see the cold, clear headwaters of the Eel River, part of the Mendocino National Forest, reopened to migrating fish and to restore natural river flows in hopes of reversing the decline of native fish stocks.

Habitats, Water, Wildlifedams, Eel River, Lake Mendocino, Lake Pillsbury, PG&E, Potter Valley Project, salmon, salmon habitat, steelhead

PG&E plans to remove both Potter Valley Project Dams—Mendo, Humboldt, Lake and Sonoma Fight

May 18, 2023

Sarah Reith, REDHEADED BLACKBELT

A planning group for the Russian River Water Forum, which is preparing for life after PG&E decommissions the Potter Valley Project, met for the first time yesterday in Ukiah. PG&E said in a town hall last month that its version of decommissioning means removing both dams. That’s unless an entity that is capable of running them steps forward before it submits a draft of the decommissioning plan to the Federal Energy Regulatory Commission, or FERC.

Tony Gigliotti, PG&E’s senior licensing project manager, laid out the timeline at a town hall about Scott Dam and Lake Pillsbury on April 27th.

“When we say decommissioning in this case, both dams will be removed as part of that, unless somebody comes forward with a proposal that PG&E looks at and accepts,” he said. “We need to ensure they can operate the dams after we give up ownership. In terms of timelines for the surrender application, there will be an initial draft November, 2023. A second draft, also available for public review, May 2024, and then the final application will be filed with FERC in January, 2025.”

Janet Walther, PG&E’s senior manager of hydro licensing, qualified that timeline a little.

“When PG&E submits our final surrender application to FERC, that would be the point of no return,” in terms of decommissioning, she said. “And really, the draft. We are looking to know, sooner than later, if there’s an entity interested in taking over the dam because that will change our surrender application and what we put in that surrender application. So I think we are looking and would like to see some initial proposals later this year, if there is interest. And we are talking with folks, as we have been since 2016, about potential interest in future ownership of Scott, and/or Cape Horn Dam.”

Water, WildlifeEel River, endangered species, Lake Pillsbury, PG&E, Potter Valley Project, Russian River, salmon, Scott Dam, water diversion

CalTrout wants old Scott Dam on Eel River removed to help salmon and steelhead

March 16, 2019

Guy Kovner, THE PRESS DEMOCRAT

A state environmental group is calling for the removal of an old dam on the Eel River, contending it threatens the future of protected salmon and steelhead while acknowledging it is a key part of the North Bay’s water supply.

Scott Dam, a 138-foot concrete dam erected in 1922, is one of five aging dams California Trout asserts are “ripe for removal” to benefit their natural surroundings and communities.

The nearly 50-year-old nonprofit known as CalTrout said in its report, “Top 5 California Dams Out,” the Eel River represents “perhaps the greatest opportunity in California to restore a watershed to its former abundance of wild salmonids.”

Scott Dam, located in Lake County’s portion of the Mendocino National Forest, has been a longstanding target of other groups, including Friends of the Eel River, who want steelhead, coho and chinook salmon to swim freely within the 288 miles of habitat in the Eel watershed blocked by the dam.

The environmentalists see a “unique opportunity” to achieve their goal, as California’s largest utility PG&E, which has owned the dam as part of a small hydropower project since 1930, has filed Chapter 11 bankruptcy and abandoned plans to sell or seek relicensing of the project that diverts 20 billion gallons of water a year from the Eel to the Russian River at Potter Valley.

Eel River interests have considered the diversion a form of theft, while the water is critical to towns and ranches on the upper Russian River from Potter Valley to Healdsburg and part of the water supply for 600,000 residents in Sonoma and Marin counties.

How the future of the Potter Valley Project will play out over the next 18 months to two years is unclear, but it appears likely to result in either decommissioning or relicensing of the project, which includes a small powerhouse and two Eel River dams.

The bottom line is either PG&E or a new owner of the project may face a choice between paying more than $90 million for a fish ladder at Scott Dam or about $70 million to remove it.

WaterEel River, endangered species, Lake Pillsbury, Potter Valley Project, Russian River, salmonids, Scott Dam, water diversion