Fiske Mill Hydro Dam Reservoir Report
Last Updated: December 13, 2025
Located on the Ashuelot River in Hinsdale, New Hampshire, the Fiske Mill Hydro Dam stands as a testament to the state's commitment to sustainable energy practices.
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Summary
Completed in 1922, this concrete dam primarily serves as a hydroelectric power source, with a height of 20 feet and a length of 200 feet. With a normal storage capacity of 50 acre-feet and a maximum storage of 90 acre-feet, the dam plays a crucial role in harnessing the river's resources for clean energy generation.
Managed by a private owner and regulated by the NHDES Dam Bureau, the Fiske Mill Hydro Dam undergoes regular inspections to ensure its structural integrity and safety. With a low hazard potential and a moderate risk assessment rating, the dam is considered to be in satisfactory condition, although its emergency action plan and risk management measures could be further developed. Despite its age, the dam continues to contribute to the local economy and the state's renewable energy goals, making it a vital piece of New Hampshire's water resource infrastructure.
As water resource and climate enthusiasts marvel at the engineering feat of the Fiske Mill Hydro Dam, they are reminded of the delicate balance between harnessing nature's power and preserving its ecosystems. With its uncontrolled spillway and buttress core design, the dam represents a blend of traditional construction techniques and modern energy efficiency standards. As New Hampshire strives towards a more sustainable future, the Fiske Mill Hydro Dam stands as a symbol of innovation and responsible water resource management in the face of climate change challenges.
Year Completed |
1922 |
Dam Length |
200 |
Dam Height |
20 |
River Or Stream |
ASHUELOT RIVER |
Primary Dam Type |
Concrete |
Surface Area |
10 |
Drainage Area |
421 |
Nid Storage |
90 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
20 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Ashuelot River At Hinsdale
|
225cfs |
Ashuelot River At West Swanzey
|
101cfs |
Green River Near Colrain
|
63cfs |
Millers River At Erving
|
169cfs |
Ashuelot River Above The Branch
|
21cfs |
S Br Ashuelot River At Webb
|
25cfs |
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Area Campgrounds
| Location | Reservations | Toilets |
|---|---|---|
Fort Dummer State Park
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Richardson-Zlogar Cabin
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Swanzey Lake Camping Area
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Pilgrim Pines Camping Area
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Fiske Mill Hydro Dam