Union Street
Key Takeaway
Union Street is classified as significant hazard in New Hampshire. It was completed in 1916 and is 110 years old. Its primary use is hydroelectric. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 15 ft (taller than 47.8% in NH) |
| Dam Length | 101 ft |
| Dam Type | Concrete |
| Max Storage | 9 acre-ft |
| Normal Storage | 9 acre-ft |
| Surface Area | 1 acres |
| Drainage Area | 44 sq mi |
| Max Discharge | 3,500 cfs |
| Year Completed | 1916 (110 years old) |
| NID ID | NH83031 |
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
American Hydro Power Company
Private
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Low Hazard 10 ftFrequently Asked Questions
What is the hazard classification of Union Street?
Union Street 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 Union Street?
Union Street is owned by American Hydro Power Company (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Union Street built?
Union Street was completed in 1916, making it 110 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 Union Street?
Union Street 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 Union Street?
Union Street has a dam height of 15 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 Union Street last inspected?
Union Street was last inspected on July 19, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.