Grizzly Forebay
Key Takeaway
Grizzly Forebay is classified as high hazard in California. It was completed in 1928 and is 98 years old. Its primary use is hydroelectric. High hazard means loss of life is likely if the dam fails — it does not indicate the dam's current condition. Learn more.
Physical Details
| Dam Height | 98 ft (taller than 81.7% in CA) |
| Dam Length | 520 ft |
| Dam Type | Concrete |
| Max Storage | 1.1K acre-ft |
| Normal Storage | 1.1K acre-ft |
| Surface Area | 38 acres |
| Drainage Area | 15 sq mi |
| Max Discharge | 9,200 cfs |
| Year Completed | 1928 (98 years old) |
| NID ID | CA00333 |
Safety Information
Loss of human life is likely if the dam fails.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
Pacific Gas and Electric Company
Private
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High Hazard 87 ftFrequently Asked Questions
What is the hazard classification of Grizzly Forebay?
Grizzly Forebay is classified as High Hazard. Loss of human life is likely if the dam fails. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Grizzly Forebay?
Grizzly Forebay is owned by Pacific Gas and Electric Company (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Grizzly Forebay built?
Grizzly Forebay was completed in 1928, making it 98 years old. Many U.S. dams were built between the 1930s and 1970s during a period of major infrastructure investment.
What is the primary purpose of Grizzly Forebay?
Grizzly Forebay serves the following purposes: Hydroelectric. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Grizzly Forebay?
Grizzly Forebay has a dam height of 98 ft. Dam height is measured from the natural streambed at the downstream toe to the top of the dam, and may differ from the visible height.
When was Grizzly Forebay last inspected?
Grizzly Forebay was last inspected on August 8, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.