PG&E Raises Dam Two Feet for Quake Safety
Published Date: 6/16/2026
Notice
Summary
Pacific Gas & Electric is making safety upgrades to the Lower Blue Lake dam in California by adding a filter, a buttress, and raising the dam by 2 feet to better handle earthquakes. They’ll also fix a nearby monitoring weir and expand the project area. These changes won’t affect water levels or cause big environmental problems, and public comments are open until July 10, 2026.
Analyzed Economic Effects
4 provisions identified: 4 benefits, 0 costs, 0 mixed.
Lower Blue Lake dam safety upgrades
Pacific Gas & Electric will install a filter and buttress and raise the Lower Blue Lake dam by 2 feet to mitigate seepage and reduce seismic risk at the Mokelumne Project in Alpine County, California.
Reservoir elevation remains unchanged
The licensee does not propose any changes to the operating elevation of Lower Blue Lake, so the reservoir's water level will remain the same under the proposed amendment.
FERC finds no significant environmental effect
FERC staff's Environmental Assessment concludes that, with the licensee's proposed protective measures, the proposed amendment would not constitute a major federal action that would significantly affect the quality of the human environment.
Repair and boundary addition for downstream weir
The licensee proposes to repair a monitoring weir downstream of Lower Blue Lake dam and incorporate that weir into the project's boundary.
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