Mamaroneck Reservoir Dam
Key Takeaway
Mamaroneck Reservoir Dam is classified as high hazard in New York. It was completed in 1928 and is 98 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 | 19 ft (taller than 53.6% in NY) |
| Dam Length | 185 ft |
| Dam Type | Concrete |
| Max Storage | 241 acre-ft |
| Normal Storage | 18 acre-ft |
| Surface Area | 18 acres |
| Drainage Area | 15 sq mi |
| Max Discharge | 4,240 cfs |
| Year Completed | 1928 (98 years old) |
| NID ID | NY00111 |
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
VILLAGE OF MAMARONECK;Westchester Joint Waterworks
Local Government
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High Hazard 30 ftFrequently Asked Questions
What is the hazard classification of Mamaroneck Reservoir Dam?
Mamaroneck Reservoir 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 Mamaroneck Reservoir Dam?
Mamaroneck Reservoir Dam is owned by VILLAGE OF MAMARONECK;Westchester Joint Waterworks (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Mamaroneck Reservoir Dam built?
Mamaroneck Reservoir Dam was completed in 1928, making it 98 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 Mamaroneck Reservoir Dam?
Mamaroneck Reservoir 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 Mamaroneck Reservoir Dam?
Mamaroneck Reservoir Dam has a dam height of 19 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 Mamaroneck Reservoir Dam last inspected?
Mamaroneck Reservoir Dam was last inspected on November 9, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.