Stanley A. Mahr Reservoir
Key Takeaway
Stanley A. Mahr Reservoir is classified as high hazard in California. It was completed in 1981 and is 45 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 | 79 ft (taller than 75.9% in CA) |
| Dam Length | 950 ft |
| Dam Type | Earth |
| Max Storage | 166 acre-ft |
| Surface Area | 8 acres |
| Drainage Area | 0 sq mi |
| Year Completed | 1981 (45 years old) |
| NID ID | CA01280 |
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
Vallecitos Water District
Public Utility
Nearby Dams
San Marcos
San Diego, CA
High Hazard 52 ftMelrose Avenue
San Diego, CA
High Hazard 57 ftSan Dieguito
San Diego, CA
High Hazard 51 ftSan Marcos
San Diego, CA
High Hazard 85 ftMaerkle
San Diego, CA
High Hazard 165 ftOlivenhain
San Diego, CA
High Hazard 309 ftCalavera
San Diego, CA
High Hazard 67 ftFairbanks
San Diego, CA
High Hazard 36 ftFrequently Asked Questions
What is the hazard classification of Stanley A. Mahr Reservoir?
Stanley A. Mahr 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 Stanley A. Mahr Reservoir?
Stanley A. Mahr Reservoir is owned by Vallecitos Water District (Public Utility). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Stanley A. Mahr Reservoir built?
Stanley A. Mahr Reservoir was completed in 1981, making it 45 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 Stanley A. Mahr Reservoir?
Stanley A. Mahr Reservoir serves the following purposes: Water Supply, Other, Irrigation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Stanley A. Mahr Reservoir?
Stanley A. Mahr Reservoir has a dam height of 79 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 Stanley A. Mahr Reservoir last inspected?
Stanley A. Mahr Reservoir was last inspected on March 24, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.