Foss Mill Reservoir Report
Nearby: Foss Mill - Dike Ellis Dam
Last Updated: December 19, 2025
Foss Mill, located in Brooks, Maine, is a privately owned hydroelectric dam on Marsh Stream.
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Summary
Completed in 1981, this arch dam stands at 13 feet tall and stretches 150 feet in length, with a storage capacity of 90 acre-feet. With a controlled spillway width of 99 feet and a maximum discharge of 4073 cubic feet per second, Foss Mill plays a crucial role in regulating water flow and generating hydroelectric power in the region.
Managed by the Federal Energy Regulatory Commission, Foss Mill has a low hazard potential and a very high risk assessment rating. Though its condition assessment is not available, the dam undergoes inspections every 3 years to ensure its safety and reliability. With a focus on emergency preparedness, Foss Mill's emergency action plan was last revised in 2009, demonstrating a commitment to mitigating potential risks and protecting the surrounding community from any unforeseen events.
As a key feature in the local water resource infrastructure, Foss Mill serves as a vital component in the region's energy production and water management systems. By harnessing the power of Marsh Stream, this dam not only provides renewable energy but also contributes to flood control and water supply management efforts. With its strategic location and reliable operation, Foss Mill stands as a testament to the intersection of water resource management and sustainable energy production in Maine's diverse landscape.
Year Completed |
1981 |
Dam Length |
150 |
Dam Height |
13 |
River Or Stream |
Marsh Stream |
Primary Dam Type |
Arch |
Surface Area |
20 |
Drainage Area |
9 |
Nid Storage |
90 |
Outlet Gates |
Other Controlled - 7 |
Hazard Potential |
Low |
Nid Height |
13 |
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.
Foss Mill