Harrisville Pond Dam
Key Takeaway
Harrisville Pond Dam is classified as high hazard in New Hampshire. It was completed in 1886 and is 140 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 | 16 ft (taller than 54.9% in NH) |
| Dam Length | 75 ft |
| Dam Type | Stone |
| Max Storage | 2.3K acre-ft |
| Normal Storage | 2.0K acre-ft |
| Surface Area | 120 acres |
| Drainage Area | 10 sq mi |
| Max Discharge | 47 cfs |
| Year Completed | 1886 (140 years old) |
| NID ID | NH00065 |
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
TWITCHELLS MILLS HYDRO CORP
Private
Nearby Dams
Cheshire Mills
Cheshire, NH
Significant Hazard 21 ftCheshire Mills Lower Dam
Cheshire, NH
High Hazard 18 ftChilds Bog Dam
Cheshire, NH
High Hazard 17 ftNubanusit Lake Dam
Cheshire, NH
Significant Hazard 16 ftSkatutakee Lake Dam
Cheshire, NH
Significant Hazard 13 ftSeaver Reservoir Dam
Cheshire, NH
High Hazard 30 ftSilver Lake Dam
Cheshire, NH
Low Hazard 12 ftHowe Reservoir Dam
Cheshire, NH
High Hazard 30 ftFrequently Asked Questions
What is the hazard classification of Harrisville Pond Dam?
Harrisville Pond 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 Harrisville Pond Dam?
Harrisville Pond Dam is owned by TWITCHELLS MILLS HYDRO CORP (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Harrisville Pond Dam built?
Harrisville Pond Dam was completed in 1886, making it 140 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 Harrisville Pond Dam?
Harrisville Pond 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 Harrisville Pond Dam?
Harrisville Pond Dam has a dam height of 16 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 Harrisville Pond Dam last inspected?
Harrisville Pond Dam was last inspected on October 28, 2021. Inspection dates indicate when a formal review occurred, not the results of that inspection.