San Joaquin Reservoir
Key Takeaway
San Joaquin Reservoir is classified as high hazard in California. It was completed in 1966 and is 60 years old. Its primary use is water supply. 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 | 224 ft (taller than 95.7% in CA) |
| Dam Length | 873 ft |
| Dam Type | Earth |
| Max Storage | 3.0K acre-ft |
| Surface Area | 50 acres |
| Drainage Area | 0 sq mi |
| Year Completed | 1966 (60 years old) |
| NID ID | CA00853 |
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
Irvine Ranch Water District
Public Utility
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High Hazard 59 ftFrequently Asked Questions
What is the hazard classification of San Joaquin Reservoir?
San Joaquin Reservoir 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 Joaquin Reservoir?
San Joaquin Reservoir is owned by Irvine Ranch Water District (Public Utility). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was San Joaquin Reservoir built?
San Joaquin Reservoir was completed in 1966, making it 60 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 Joaquin Reservoir?
San Joaquin Reservoir serves the following purposes: Water Supply. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is San Joaquin Reservoir?
San Joaquin Reservoir has a dam height of 224 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 Joaquin Reservoir last inspected?
San Joaquin Reservoir was last inspected on June 13, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.