Murphys Afterbay
Key Takeaway
Murphys Afterbay is classified as high hazard in California. It was completed in 1953 and is 73 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 | 43 ft (taller than 51.5% in CA) |
| Dam Length | 340 ft |
| Dam Type | Earth |
| Max Storage | 31 acre-ft |
| Normal Storage | 31 acre-ft |
| Surface Area | 3 acres |
| Drainage Area | 3 sq mi |
| Max Discharge | 1,450 cfs |
| Year Completed | 1953 (73 years old) |
| NID ID | CA00410 |
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
Utica Water & Power Authority
Public Utility
Nearby Dams
Andrew Cademartori
Calaveras, CA
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Low Hazard 60 ftMurphys Wastewater
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Low Hazard 44 ftStanislaus Forebay East
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Low Hazard 55 ftHunters
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High Hazard 35 ftFrequently Asked Questions
What is the hazard classification of Murphys Afterbay?
Murphys Afterbay 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 Murphys Afterbay?
Murphys Afterbay is owned by Utica Water & Power Authority (Public Utility). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Murphys Afterbay built?
Murphys Afterbay was completed in 1953, making it 73 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 Murphys Afterbay?
Murphys Afterbay serves the following purposes: Hydroelectric, Irrigation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Murphys Afterbay?
Murphys Afterbay has a dam height of 43 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 Murphys Afterbay last inspected?
Murphys Afterbay was last inspected on May 31, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.