Iroquois
Key Takeaway
Iroquois is classified as significant hazard in New York. It was completed in 1958 and is 68 years old. Its primary use is hydroelectric. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 67 ft (taller than 95.9% in NY) |
| Dam Length | 1,980 ft |
| Dam Type | Concrete |
| Max Storage | 803.0K acre-ft |
| Normal Storage | 750.0K acre-ft |
| Surface Area | 37,500 acres |
| Drainage Area | 300,000 sq mi |
| Max Discharge | 385,000 cfs |
| Year Completed | 1958 (68 years old) |
| NID ID | NY00676 |
Safety Information
No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
New York Power Authority
State Government
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Iroquois?
Iroquois is classified as Significant Hazard. No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Iroquois?
Iroquois is owned by New York Power Authority (State Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Iroquois built?
Iroquois was completed in 1958, making it 68 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 Iroquois?
Iroquois serves the following purposes: Hydroelectric, Navigation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Iroquois?
Iroquois has a dam height of 67 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 Iroquois last inspected?
Iroquois was last inspected on August 4, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.