Ice House Reservoir Report
Nearby: Plow Shop Pond Dam Balch Pond Dam
Last Updated: December 17, 2025
Ice House, also known as West Main St.
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Summary
Dam, is a private hydroelectric structure located in Ayer, Massachusetts, near the Nashua River. Built in 1906, this dam stands at a height of 12 feet and has a structural height of 15 feet, with a storage capacity of 965 acre-feet and a normal storage level of 965 feet. With a controlled spillway width of 225 feet and a maximum discharge capacity of 7200 cubic feet per second, Ice House plays a crucial role in managing water flow and generating hydroelectric power in the region.
Despite its age, Ice House is classified as having a low hazard potential and is regularly inspected by the Federal Energy Regulatory Commission. The dam features a slide (sluice gate) outlet gate and has an emergency action plan prepared, meeting guidelines for risk management. However, the risk assessment for Ice House indicates a very high risk level (1), highlighting the need for continued monitoring and maintenance to ensure the safety and functionality of this important water resource infrastructure in Middlesex County, Massachusetts.
Ice House serves as a testament to the historical significance and ongoing relevance of hydroelectric infrastructure in the region, while also underscoring the importance of proactive risk management and maintenance practices in the face of evolving climate challenges. As water resource and climate enthusiasts, understanding the intricate details and operational aspects of structures like Ice House can provide valuable insights into the intersection of human ingenuity, environmental stewardship, and sustainable energy generation in the 21st century.
Year Completed |
1906 |
Dam Length |
400 |
Dam Height |
12 |
River Or Stream |
Nashua River |
Primary Dam Type |
Other |
Surface Area |
137 |
Hydraulic Height |
10 |
Drainage Area |
304 |
Nid Storage |
965 |
Structural Height |
15 |
Outlet Gates |
Slide (sluice gate) - 1 |
Hazard Potential |
Low |
Nid Height |
15 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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 |
|---|---|---|
Grotonwood
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Pearl Hill Campground
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Damon Pond Campground
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Ice House
Great Road 687, Littleton