Diemer Reservoir
Key Takeaway
Diemer Reservoir is classified as high hazard in California. It was completed in 1963 and is 63 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 | 22 ft (taller than 18.8% in CA) |
| Dam Length | 1,880 ft |
| Dam Type | Other |
| Max Storage | 80 acre-ft |
| Surface Area | 5 acres |
| Drainage Area | 0 sq mi |
| Year Completed | 1963 (63 years old) |
| NID ID | CA00221 |
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
Metropolitan Water District Of Southern California
Public Utility
Nearby Dams
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High Hazard 32 ftDiemer No. 8
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Significant Hazard 172 ftCarbon Canyon Dam
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High Hazard 99 ftYorba
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High Hazard 45 ftFullerton Dam
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High Hazard 46 ftOrange County Reservoir
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High Hazard 103 ftChino Ranch #1
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Significant Hazard 22 ft30 Mg Central Reservoir
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High Hazard 30 ftFrequently Asked Questions
What is the hazard classification of Diemer Reservoir?
Diemer 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 Diemer Reservoir?
Diemer Reservoir is owned by Metropolitan Water District Of Southern California (Public Utility). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Diemer Reservoir built?
Diemer Reservoir was completed in 1963, making it 63 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 Diemer Reservoir?
Diemer 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 Diemer Reservoir?
Diemer Reservoir has a dam height of 22 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 Diemer Reservoir last inspected?
Diemer Reservoir was last inspected on August 17, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.