Bear Swamp - Dike A Reservoir Report
Last Updated: December 21, 2025
Bear Swamp - Dike A, also known as Bear Swamp Upper Reservoir Dike, is a crucial structure located in Charlemont, Massachusetts, along the Deerfield River.
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Summary
Built in 1974 for hydroelectric purposes, this earth and rockfill dam stands at a height of 23 feet and stretches 352 feet in length, providing a maximum storage capacity of 5,100 acre-feet. Despite its low hazard potential, the dam is under the jurisdiction of the Federal Energy Regulatory Commission, which oversees its inspections and operations.
This dam is part of a larger complex that includes two other associated structures, contributing to a surface area of 118 acres and a drainage area of 0.1 square miles. While the dam does not have a spillway, its risk assessment is classified as high due to its location and potential impact in case of failure. The emergency action plan for Bear Swamp - Dike A was last reviewed in 2014, highlighting the importance of preparedness and risk management measures for this critical water resource infrastructure.
With its strategic location in Franklin County, Massachusetts, Bear Swamp - Dike A plays a vital role in harnessing the hydropower potential of the region. As climate change impacts continue to affect water resources, the maintenance and monitoring of this dam are essential to ensure its long-term functionality and the safety of surrounding communities. The collaboration between federal and state agencies in overseeing the dam's operation underscores the importance of effective governance and risk mitigation strategies in safeguarding our water infrastructure for future generations.
Year Completed |
1974 |
Dam Length |
352 |
Dam Height |
23 |
River Or Stream |
Deerfield River |
Surface Area |
118 |
Drainage Area |
0.1 |
Nid Storage |
5100 |
Hazard Potential |
Low |
Nid Height |
23 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Deerfield River At Charlemont
|
1540cfs |
Hoosic River At Adams
|
213cfs |
Hoosic River Near Williamstown
|
747cfs |
Green River At Williamstown
|
202cfs |
North River At Shattuckville
|
463cfs |
Green River Near Colrain
|
218cfs |
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 |
|---|---|---|
Mohawk Trail State Forest
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Savoy Mountain State Forest
|
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Historic Valley
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Clarksburg State Park
|
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Windsor State Forest
|
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Sherman Brook Campsite
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Bear Swamp - Dike A
Stamford Town Line To Confluence With City Stream