Halsey Forebay No. 1
Key Takeaway
Halsey Forebay No. 1 is classified as high hazard in California. It was completed in 1913 and is 113 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 | 42 ft (taller than 50.1% in CA) |
| Dam Length | 850 ft |
| Dam Type | Earth |
| Max Storage | 244 acre-ft |
| Normal Storage | 244 acre-ft |
| Surface Area | 18 acres |
| Max Discharge | 1,200 cfs |
| Year Completed | 1913 (113 years old) |
| NID ID | CA00352 |
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 36 ftFrequently Asked Questions
What is the hazard classification of Halsey Forebay No. 1?
Halsey Forebay No. 1 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 Halsey Forebay No. 1?
Halsey Forebay No. 1 is owned by Pacific Gas and Electric Company (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Halsey Forebay No. 1 built?
Halsey Forebay No. 1 was completed in 1913, making it 113 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 Halsey Forebay No. 1?
Halsey Forebay No. 1 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 Halsey Forebay No. 1?
Halsey Forebay No. 1 has a dam height of 42 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 Halsey Forebay No. 1 last inspected?
Halsey Forebay No. 1 was last inspected on August 7, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.