Wassookeag Lake Reservoir Report
Nearby: Puffers Pond Weymouth Pond
Last Updated: December 19, 2025
Wassookeag Lake in Dexter, Maine, is a captivating water resource nestled along the EB Sebasticook river, with a primary purpose of flood risk reduction.
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Summary
This rockfill dam, completed in 1914, stands at a height of 14 feet and has a storage capacity of 12,200 acre-feet, with a normal storage level of 8,500 acre-feet. The lake covers a surface area of 1,064 acres and serves multiple purposes including flood risk reduction, recreation, and water supply.
Managed by the Maine Emergency Management Agency, Wassookeag Lake is regulated by the state and undergoes regular inspections to ensure its structural integrity. Despite being classified with a high hazard potential, the dam is reported to be in satisfactory condition as of the last assessment in 2015. The area surrounding the lake offers a serene environment for water and climate enthusiasts to appreciate the beauty of nature while also recognizing the importance of responsible water resource management in mitigating flood risks and supporting local communities.
Year Completed |
1914 |
Dam Length |
100 |
Dam Height |
14 |
River Or Stream |
EB Sebasticook |
Primary Dam Type |
Rockfill |
Surface Area |
1064 |
Hydraulic Height |
10 |
Drainage Area |
17 |
Nid Storage |
12200 |
Structural Height |
14 |
Hazard Potential |
High |
Nid Height |
14 |
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.
Wassookeag Lake