Upper Peak Lake
Key Takeaway
Upper Peak Lake is classified as high hazard in California. It was completed in 1850 and is 176 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 | 39 ft (taller than 44.4% in CA) |
| Dam Length | 214 ft |
| Dam Type | Earth |
| Max Storage | 207 acre-ft |
| Normal Storage | 1.7K acre-ft |
| Surface Area | 21 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 680 cfs |
| Year Completed | 1850 (176 years old) |
| NID ID | CA00371 |
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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Low Hazard 38 ftFrequently Asked Questions
What is the hazard classification of Upper Peak Lake?
Upper Peak Lake 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 Upper Peak Lake?
Upper Peak Lake is owned by Pacific Gas and Electric Company (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Upper Peak Lake built?
Upper Peak Lake was completed in 1850, making it 176 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 Upper Peak Lake?
Upper Peak Lake 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 Upper Peak Lake?
Upper Peak Lake has a dam height of 39 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 Upper Peak Lake last inspected?
Upper Peak Lake was last inspected on June 28, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.