San Antonio Dam
Key Takeaway
San Antonio Dam is classified as high hazard in California. It was completed in 1956 and is 70 years old. Its primary use is flood risk reduction. 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 | 160 ft (taller than 91% in CA) |
| Dam Length | 3,850 ft |
| Dam Type | Earth |
| Max Storage | 11.9K acre-ft |
| Normal Storage | 0 acre-ft |
| Surface Area | 1 acres |
| Drainage Area | 27 sq mi |
| Max Discharge | 53,700 cfs |
| Year Completed | 1956 (70 years old) |
| NID ID | CA10023 |
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
USACE - Los Angeles District
Federal Government
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High Hazard 22 ftFrequently Asked Questions
What is the hazard classification of San Antonio Dam?
San Antonio Dam 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 San Antonio Dam?
San Antonio Dam is owned by USACE - Los Angeles District (Federal Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was San Antonio Dam built?
San Antonio Dam was completed in 1956, making it 70 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 San Antonio Dam?
San Antonio Dam serves the following purposes: Flood Risk Reduction. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is San Antonio Dam?
San Antonio Dam has a dam height of 160 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 San Antonio Dam last inspected?
San Antonio Dam was last inspected on March 15, 2021. Inspection dates indicate when a formal review occurred, not the results of that inspection.