South Mill Pond Dam
Key Takeaway
South Mill Pond Dam is classified as low hazard in New Hampshire. It was completed in 1983 and is 43 years old. Its primary use is recreation.
Physical Details
| Dam Height | 14 ft (taller than 42.1% in NH) |
| Dam Length | 75 ft |
| Dam Type | Earth |
| Max Storage | 85 acre-ft |
| Normal Storage | 18 acre-ft |
| Surface Area | 9 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 1,760 cfs |
| Year Completed | 1983 (43 years old) |
| NID ID | NH00536 |
Safety Information
No probable loss of human life and low economic/environmental losses expected.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
CITY OF PORTSMOUTH
Local Government
Nearby Dams
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Low Hazard 9 ftMill Pond Dam
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Significant Hazard 70 ftFrequently Asked Questions
What is the hazard classification of South Mill Pond Dam?
South Mill Pond Dam is classified as Low Hazard. No probable loss of human life and low economic/environmental losses expected. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates South Mill Pond Dam?
South Mill Pond Dam is owned by CITY OF PORTSMOUTH (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was South Mill Pond Dam built?
South Mill Pond Dam was completed in 1983, making it 43 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 South Mill Pond Dam?
South Mill 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 South Mill Pond Dam?
South Mill Pond Dam has a dam height of 14 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 South Mill Pond Dam last inspected?
South Mill Pond Dam was last inspected on June 2, 2021. Inspection dates indicate when a formal review occurred, not the results of that inspection.