Thornwood Commons Pond Dam
Key Takeaway
Thornwood Commons Pond Dam is classified as significant hazard in New Hampshire. It was completed in 1961 and is 65 years old. Its primary use is fish and wildlife pond. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 16 ft (taller than 54.9% in NH) |
| Dam Length | 420 ft |
| Dam Type | Earth |
| Max Storage | 32 acre-ft |
| Normal Storage | 12 acre-ft |
| Surface Area | 2 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 173 cfs |
| Year Completed | 1961 (65 years old) |
| Year Modified | 2010 |
| NID ID | NH01700 |
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
VARNEY BROOK LANDS LLC
Private
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Low Hazard 12 ftFrequently Asked Questions
What is the hazard classification of Thornwood Commons Pond Dam?
Thornwood Commons Pond Dam 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 Thornwood Commons Pond Dam?
Thornwood Commons Pond Dam is owned by VARNEY BROOK LANDS LLC (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Thornwood Commons Pond Dam built?
Thornwood Commons Pond Dam was completed in 1961, making it 65 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 Thornwood Commons Pond Dam?
Thornwood Commons Pond Dam serves the following purposes: Fish And Wildlife Pond. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Thornwood Commons Pond Dam?
Thornwood Commons 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 Thornwood Commons Pond Dam last inspected?
Thornwood Commons Pond Dam was last inspected on July 30, 2021. Inspection dates indicate when a formal review occurred, not the results of that inspection.