Main Mill Dam
Key Takeaway
Main Mill Dam is classified as high hazard in New York. It was completed in 1881 and is 145 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 | 25 ft (taller than 69.7% in NY) |
| Dam Length | 715 ft |
| Dam Type | Concrete |
| Max Storage | 920 acre-ft |
| Normal Storage | 830 acre-ft |
| Surface Area | 84 acres |
| Drainage Area | 608 sq mi |
| Max Discharge | 15,820 cfs |
| Year Completed | 1881 (145 years old) |
| NID ID | NY00262 |
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
IMPERIAL INDUSTRIAL PARK;NYS DEC - DIVISION OF FISH AND WILDLIFE
Private
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What is the hazard classification of Main Mill Dam?
Main Mill 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 Main Mill Dam?
Main Mill Dam is owned by IMPERIAL INDUSTRIAL PARK;NYS DEC - DIVISION OF FISH AND WILDLIFE (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Main Mill Dam built?
Main Mill Dam was completed in 1881, making it 145 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 Main Mill Dam?
Main Mill Dam serves the following purposes: Hydroelectric. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Main Mill Dam?
Main Mill Dam has a dam height of 25 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 Main Mill Dam last inspected?
Main Mill Dam was last inspected on September 18, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.