Sweetwater
Key Takeaway
Sweetwater is classified as significant hazard in New Hampshire. It was completed in 1922 and is 104 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 | 314 ft |
| Dam Type | Concrete |
| Max Storage | 150 acre-ft |
| Normal Storage | 150 acre-ft |
| Surface Area | 17 acres |
| Drainage Area | 270 sq mi |
| Max Discharge | 10,668 cfs |
| Year Completed | 1922 (104 years old) |
| NID ID | NH00140 |
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
Sweetwater Hydroelectric, Inc.
Private
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Low Hazard 23 ftFrequently Asked Questions
What is the hazard classification of Sweetwater?
Sweetwater 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 Sweetwater?
Sweetwater is owned by Sweetwater Hydroelectric, Inc. (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Sweetwater built?
Sweetwater was completed in 1922, making it 104 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 Sweetwater?
Sweetwater serves the following purposes: Hydroelectric. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Sweetwater?
Sweetwater 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 Sweetwater last inspected?
Sweetwater was last inspected on August 17, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.