Lower Valley
Key Takeaway
Lower Valley is classified as significant hazard in New Hampshire. It was completed in 1921 and is 105 years old. Its primary use is hydroelectric. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 33 ft (taller than 89.6% in NH) |
| Dam Length | 145 ft |
| Dam Type | Concrete |
| Max Storage | 24 acre-ft |
| Normal Storage | 24 acre-ft |
| Surface Area | 2 acres |
| Drainage Area | 252 sq mi |
| Max Discharge | 7,172 cfs |
| Year Completed | 1921 (105 years old) |
| NID ID | NH00139 |
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
Lower Valley, LLC
Private
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Low Hazard 11 ftFrequently Asked Questions
What is the hazard classification of Lower Valley?
Lower Valley 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 Lower Valley?
Lower Valley is owned by Lower Valley, LLC (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Lower Valley built?
Lower Valley was completed in 1921, making it 105 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 Lower Valley?
Lower Valley serves the following purposes: Hydroelectric, Water Supply. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Lower Valley?
Lower Valley has a dam height of 33 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 Lower Valley last inspected?
Lower Valley was last inspected on August 26, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.