Sebasticook Reservoir Report
Nearby: Mulligan Bog Spragues Mill
Last Updated: December 19, 2025
Sebasticook is a concrete dam located in Penobscot, Maine, with a primary purpose of hydroelectric power generation.
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Summary
Completed in 1988, this dam stands at a height of 15 feet and has a hydraulic height of 10 feet. It has a normal storage capacity of 10,560 acre-feet and a total surface area of 4,288 acres, serving various purposes such as fire protection, stock maintenance, and recreation in addition to hydroelectric power generation.
Managed by the local government and regulated by the Maine Emergency Management Agency (MEMA), Sebasticook has a low hazard potential and was last inspected in October 2014, with a satisfactory condition assessment. The dam has a spillway width of 102 feet and falls under the jurisdiction of the New England District of the US Army Corps of Engineers. With its strategic location and operational efficiency, Sebasticook plays a crucial role in water resource management and climate resilience efforts in the region.
For water resource and climate enthusiasts, Sebasticook offers a fascinating case study in sustainable dam infrastructure development and management. Its multi-purpose functionality, from power generation to recreational activities, showcases the importance of balancing human needs with environmental preservation. With its low hazard potential and satisfactory condition assessment, Sebasticook stands as a reliable infrastructure asset contributing to the resilience of water resources in Maine's Penobscot County.
Year Completed |
1988 |
Dam Length |
128 |
Dam Height |
15 |
River Or Stream |
Sebasticook |
Primary Dam Type |
Concrete |
Surface Area |
4288 |
Hydraulic Height |
10 |
Drainage Area |
128 |
Nid Storage |
14100 |
Structural Height |
15 |
Hazard Potential |
Low |
Nid Height |
15 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Kenduskeag Stream Near Bangor
|
51cfs |
Piscataquis River Near Dover-Foxcroft
|
341cfs |
Kingsbury Stream At Abbot Village
|
60cfs |
Kennebec River At North Sidney
|
2500cfs |
Piscataquis River At Blanchard
|
67cfs |
Kennebec River At Bingham
|
2680cfs |
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.
Sebasticook