Thompsons Reservoir Report
Nearby: Tacoma Lakes Annabessacook Lake
Last Updated: December 17, 2025
Thompsons, located in Kennebec, Maine, is a privately owned dam with a primary purpose of fire protection, stock, or small fish pond.
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Summary
Built in 1850, this concrete dam stands at 17 feet tall with a hydraulic height of 10 feet and a length of 90 feet. With a storage capacity of 150 acre-feet, Thompsons serves various purposes including fire protection, stock, small fish pond, fish and wildlife pond, and recreation.
Maintained by the Maine Emergency Management Agency (MEMA), Thompsons is regulated, permitted, inspected, and enforced by the state. Its hazard potential is rated as low, with a condition assessment that is currently not rated. The dam has a spillway width of 10 feet and a surface area of 20 acres. Although last inspected in 2013, the dam's emergency action plan status, risk assessment, and inundation maps are currently not available, indicating a need for updated emergency preparedness measures.
Thompsons, situated on Potters Brook, falls under the jurisdiction of the New England District. Despite its age, the dam continues to provide essential services while operating safely. As the climate changes and water resources become increasingly important, ongoing monitoring and maintenance of dams like Thompsons are crucial to ensure their effectiveness in protecting communities and the environment.
Year Completed |
1850 |
Dam Length |
90 |
Dam Height |
17 |
River Or Stream |
Potters Brook |
Primary Dam Type |
Concrete |
Surface Area |
20 |
Hydraulic Height |
10 |
Nid Storage |
150 |
Structural Height |
17 |
Hazard Potential |
Low |
Nid Height |
17 |
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.
Thompsons
Litchfield