Grassy Sprain Reservoir Dam
Key Takeaway
Grassy Sprain Reservoir Dam is classified as high hazard in New York. It was completed in 1876 and is 150 years old. Its primary use is recreation. 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 | 40 ft (taller than 88.1% in NY) |
| Dam Length | 600 ft |
| Dam Type | Earth |
| Max Storage | 3.6K acre-ft |
| Normal Storage | 3.0K acre-ft |
| Surface Area | 150 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 1,025 cfs |
| Year Completed | 1876 (150 years old) |
| NID ID | NY00022 |
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
CITY OF YONKERS
Local Government
Nearby Dams
Crestwood Lake Dam
Westchester, NY
Significant Hazard 10 ftSouth Westchester Detention Basin Dam
Westchester, NY
Significant Hazard 7 ftReservoir #2 Dam
Westchester, NY
Significant Hazard 25 ftNew Rochelle Reservoir #3 Dam
Westchester, NY
High Hazard 30 ftNew Rochelle Reservoir #1 Dam
Westchester, NY
High Hazard 30 ftHillview Reservoir Dam
Westchester, NY
High Hazard 90 ftWoodlands Lake Dam
Westchester, NY
Significant Hazard 20 ftGlenwood Lake Dam
Westchester, NY
Significant Hazard 12 ftFrequently Asked Questions
What is the hazard classification of Grassy Sprain Reservoir Dam?
Grassy Sprain 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 Grassy Sprain Reservoir Dam?
Grassy Sprain Reservoir Dam is owned by CITY OF YONKERS (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Grassy Sprain Reservoir Dam built?
Grassy Sprain Reservoir Dam was completed in 1876, making it 150 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 Grassy Sprain Reservoir Dam?
Grassy Sprain Reservoir Dam serves the following purposes: Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Grassy Sprain Reservoir Dam?
Grassy Sprain Reservoir Dam has a dam height of 40 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 Grassy Sprain Reservoir Dam last inspected?
Grassy Sprain Reservoir Dam was last inspected on November 9, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.