Supply Pond Dam
Key Takeaway
Supply Pond Dam is classified as high hazard in New Hampshire. It was completed in 1854 and is 172 years old. Its primary use is water supply. 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 | 28 ft (taller than 84.8% in NH) |
| Dam Length | 550 ft |
| Dam Type | Earth |
| Max Storage | 414 acre-ft |
| Normal Storage | 210 acre-ft |
| Surface Area | 15 acres |
| Drainage Area | 27 sq mi |
| Year Completed | 1854 (172 years old) |
| Year Modified | 2004 |
| NID ID | NH00123 |
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
PENNICHUCK WATER WORKS INC
Private
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Low Hazard 28 ftFrequently Asked Questions
What is the hazard classification of Supply Pond Dam?
Supply 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 Supply Pond Dam?
Supply Pond Dam is owned by PENNICHUCK WATER WORKS INC (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Supply Pond Dam built?
Supply Pond Dam was completed in 1854, making it 172 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 Supply Pond Dam?
Supply Pond Dam serves the following purposes: Water Supply. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Supply Pond Dam?
Supply Pond Dam has a dam height of 28 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 Supply Pond Dam last inspected?
Supply Pond Dam was last inspected on September 27, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.