Cheshire Mills
Key Takeaway
Cheshire Mills is classified as significant hazard in New Hampshire. It was completed in 1886 and is 140 years old. Its primary use is hydroelectric. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 21 ft (taller than 74.5% in NH) |
| Dam Length | 94 ft |
| Max Storage | 2 acre-ft |
| Normal Storage | 1 acre-ft |
| Surface Area | 0 acres |
| Drainage Area | 11 sq mi |
| Max Discharge | 600 cfs |
| Year Completed | 1886 (140 years old) |
| NID ID | NH00067 |
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
Historic Harrisville, Inc.
Private
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High Hazard 30 ftFrequently Asked Questions
What is the hazard classification of Cheshire Mills?
Cheshire Mills 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 Cheshire Mills?
Cheshire Mills is owned by Historic Harrisville, Inc. (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Cheshire Mills built?
Cheshire Mills 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 Cheshire Mills?
Cheshire Mills 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 Cheshire Mills?
Cheshire Mills has a dam height of 21 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 Cheshire Mills last inspected?
Cheshire Mills was last inspected on August 25, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.