Derry Waste Lagoon Dam
Key Takeaway
Derry Waste Lagoon Dam is classified as significant hazard in New Hampshire. It was completed in 1978 and is 48 years old. Its primary use is other. 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 | 3,560 ft |
| Dam Type | Earth |
| Max Storage | 346 acre-ft |
| Normal Storage | 346 acre-ft |
| Surface Area | 17 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 0 cfs |
| Year Completed | 1978 (48 years old) |
| Year Modified | 2002 |
| NID ID | NH00961 |
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
TOWN OF DERRY
Local Government
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Low Hazard 8 ftFrequently Asked Questions
What is the hazard classification of Derry Waste Lagoon Dam?
Derry Waste Lagoon 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 Derry Waste Lagoon Dam?
Derry Waste Lagoon Dam is owned by TOWN OF DERRY (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Derry Waste Lagoon Dam built?
Derry Waste Lagoon Dam was completed in 1978, making it 48 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 Derry Waste Lagoon Dam?
Derry Waste Lagoon Dam serves the following purposes: Other. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Derry Waste Lagoon Dam?
Derry Waste Lagoon Dam 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 Derry Waste Lagoon Dam last inspected?
Derry Waste Lagoon Dam was last inspected on November 12, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.