Folsom Pond Reservoir Report
Nearby: Mattanawcook Pond Long Pond
Last Updated: December 21, 2025
Folsom Pond in Maine is a privately-owned concrete dam built in 1918 for flood risk reduction along the Mattanawcook Stream.
°F
°F
mph
Wind
%
Humidity
Summary
With a height of 18 feet and a storage capacity of 3,345 acre-feet, the dam serves to protect the surrounding area from potential flooding events. The reservoir created by Folsom Pond covers a surface area of 502 acres and has a normal storage capacity of 2,500 acre-feet.
Despite its age, Folsom Pond has a low hazard potential and is currently in a condition that has not been rated. The last inspection of the dam was conducted in 2007, indicating a need for updated assessments and potentially improvements. While the dam is regulated by the Maine Emergency Management Agency and has state permitting, inspection, and enforcement measures in place, there is room for further evaluation and risk management to ensure the safety and efficacy of this critical infrastructure for flood control in the region. For water resource and climate enthusiasts, Folsom Pond presents an intriguing case study of historic dam infrastructure in need of modern assessment and potentially upgrades to meet contemporary safety standards.
Year Completed |
1918 |
Dam Length |
100 |
Dam Height |
18 |
River Or Stream |
Mattanawcook Stream |
Primary Dam Type |
Concrete |
Surface Area |
502 |
Hydraulic Height |
10 |
Drainage Area |
12.2 |
Nid Storage |
3345 |
Structural Height |
18 |
Hazard Potential |
Low |
Nid Height |
18 |
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.
Folsom Pond
Aldrich Point Road Lincoln