Shannon Lake Dam
Key Takeaway
Shannon Lake Dam is classified as significant hazard in New Hampshire. It was completed in 1930 and is 96 years old. Its primary use is recreation. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 20 ft (taller than 70.9% in NH) |
| Dam Length | 300 ft |
| Dam Type | Earth |
| Max Storage | 21 acre-ft |
| Normal Storage | 15 acre-ft |
| Surface Area | 4 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 3,195 cfs |
| Year Completed | 1930 (96 years old) |
| Year Modified | 1969 |
| NID ID | NH00562 |
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
CASTLE PRESERVATION SOCIETY
Private
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High Hazard 45 ftFrequently Asked Questions
What is the hazard classification of Shannon Lake Dam?
Shannon Lake 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 Shannon Lake Dam?
Shannon Lake Dam is owned by CASTLE PRESERVATION SOCIETY (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Shannon Lake Dam built?
Shannon Lake Dam was completed in 1930, making it 96 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 Shannon Lake Dam?
Shannon Lake 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 Shannon Lake Dam?
Shannon Lake Dam has a dam height of 20 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 Shannon Lake Dam last inspected?
Shannon Lake Dam was last inspected on April 21, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.