Swan Lake Reservoir Report
Nearby: Half Moon Pond Mason
Last Updated: December 22, 2025
Swan Lake in Maine is a private hydroelectric facility located in Swanville along the Goose River.
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Summary
The dam, completed in 1900, is primarily made of concrete and has a height of 10 feet and a length of 250 feet. With a maximum storage capacity of 11,270 acre-feet and a normal storage of 7,500 acre-feet, Swan Lake covers a surface area of 1,510 acres and serves a drainage area of 10 square miles. The dam features a controlled spillway with a width of 11 feet and three other controlled outlet gates.
Despite its low hazard potential, Swan Lake is classified as a very high-risk facility, receiving a risk rating of 1. The Federal Energy Regulatory Commission oversees the regulatory aspects of the dam, including inspections and operations. Although the condition assessment of the dam is currently not available, Swan Lake undergoes inspections every three years to ensure its structural integrity and safety. With its historical significance and contribution to hydroelectric power generation, Swan Lake remains a vital water resource in the region for both environmental preservation and sustainable energy production.
Year Completed |
1900 |
Dam Length |
250 |
Dam Height |
10 |
River Or Stream |
Goose River |
Primary Dam Type |
Concrete |
Surface Area |
1510 |
Drainage Area |
10 |
Nid Storage |
11270 |
Outlet Gates |
Other Controlled - 3 |
Hazard Potential |
Low |
Nid Height |
10 |
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.
Swan Lake