Birch Hill Dam Reservoir Report
Last Updated: December 12, 2025
Birch Hill Dam, located in Athol, Massachusetts, is a federally-owned structure managed by the US Army Corps of Engineers (USACE) for flood risk reduction along the Millers River.
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Summary
This earth dam, completed in 1942, stands at a height of 49 feet and has a maximum storage capacity of 76,500 acre-feet. The dam's spillway, with a width of 1,100 feet, is uncontrolled, allowing for the release of water to manage water levels and relieve pressure during severe weather events.
With a high hazard potential, Birch Hill Dam is subject to frequent inspections and risk management measures by USACE to ensure its structural integrity and preparedness for potential emergencies. The agency actively monitors the dam's condition, engages with emergency managers, and updates the emergency action plan to mitigate flood risks and protect downstream communities. Despite the dam's limitations in storing water, USACE works diligently to address all types of flood risk associated with the structure, emphasizing the importance of public awareness and preparedness in the event of a dam-related emergency.
As water resource and climate enthusiasts, it is crucial to recognize Birch Hill Dam as a key component in managing flood risks in the region. By understanding the dam's design, function, and risk management strategies, we can appreciate the complexities involved in balancing water storage and release to safeguard communities and infrastructure from potential flooding events. The ongoing efforts of USACE to maintain and monitor Birch Hill Dam highlight the agency's commitment to ensuring the safety and resilience of water resources in Massachusetts.
Year Completed |
1942 |
Dam Length |
1400 |
Dam Height |
49 |
River Or Stream |
MILLERS RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
44 |
Drainage Area |
175 |
Nid Storage |
76500 |
Structural Height |
49 |
Hazard Potential |
High |
Foundations |
Soil |
Nid Height |
49 |
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 |
|---|---|---|
North Dennison Camping Area
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Beaman Pond Campground
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East Dennison Camping Area
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Otter River State Forest
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Lake Dennison State Park
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Tully Lake
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Birch Hill Dam
River Road Royalston