Agnew Lake
Key Takeaway
Agnew Lake is classified as high hazard in California. It was completed in 1916 and is 110 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 | 30 ft (taller than 30.4% in CA) |
| Dam Length | 278 ft |
| Dam Type | Concrete |
| Max Storage | 810 acre-ft |
| Normal Storage | 810 acre-ft |
| Surface Area | 40 acres |
| Drainage Area | 23 sq mi |
| Max Discharge | 1,600 cfs |
| Year Completed | 1916 (110 years old) |
| NID ID | CA00454 |
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
Southern California Edison Company
Private
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Agnew Lake?
Agnew 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 Agnew Lake?
Agnew Lake is owned by Southern California Edison Company (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Agnew Lake built?
Agnew Lake was completed in 1916, making it 110 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 Agnew Lake?
Agnew Lake serves the following purposes: Hydroelectric, Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Agnew Lake?
Agnew Lake has a dam height of 30 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 Agnew Lake last inspected?
Agnew Lake was last inspected on July 18, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.