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Independent regulatory commissions

Revised Drawdown Curve for Pinecrest Reservoir Meets Compliance Requirements

Strategic Insights

— 1 min read

The Pacific Gas and Electric Company has submitted a revised drawdown curve for the Pinecrest Reservoir as per the requirements of the Federal Energy Regulatory Commission's license, FERC No. 2130-CA. The updated curve was developed based on the forecasted hydrological conditions for the year 2025 and was submitted to the relevant agencies on June 24, 2025. The revised drawdown curve has received concurrence from the U.S. Forest Service and the California State Water Resources Control Board.

Key Takeaways:

  • The revised drawdown curve for the Pinecrest Reservoir was developed based on the forecasted hydrological conditions for the year 2025.
  • The updated curve was submitted to the relevant agencies, including the U.S. Forest Service, the California State Water Resources Control Board, the U.S. Fish and Wildlife Service, and the California Department of Fish and Wildlife, on June 24, 2025.
  • The revised drawdown curve includes the actual End of Spill date, updated evaporation loss rate assumptions, updated monthly flow rates forecasted at gages S-61, S-9, and S-83, and revised forecasted Labor Day and Columbus Day Pinecrest Lake levels.
  • The revised drawdown curve was developed to meet the specified Pinecrest Reach and Philadelphia minimum and maximum streamflow requirements for the water year type.
  • The U.S. Forest Service and the California State Water Resources Control Board have concurred with the revised drawdown curve.

Statistics:

  • The revised drawdown curve for the Pinecrest Reservoir was submitted on June 24, 2025.
  • The actual End of Spill date was included in the revised drawdown curve.
  • The updated evaporation loss rate assumptions were included in the revised drawdown curve.
  • The updated monthly flow rates forecasted at gages S-61, S-9, and S-83 were included in the revised drawdown curve.
  • The revised forecasted Labor Day and Columbus Day Pinecrest Lake levels were included in the revised drawdown curve.

Sources:

  • Debbie-Anne Reese, Secretary, Federal Energy Regulatory Commission, Division of Hydropower Administration and Compliance, 888 First Street, NE, Washington, D.C. 20426, RE: Spring Gap-Stanislaus Hydroelectric Project, FERC No. 2130-CA, Forest Service Condition No. 34, California State Water Resources Control Board Condition No. 4 (no date mentioned).
  • Ben Lloyd, Senior License Coordinator, Pacific Gas and Electric Company, Enclosures: 1. 2025 Pinecrest Drawdown Curve- REVISED End of Spill, 2. Agency Consultation Record (no date mentioned).

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