Branch Lake Reservoir Report
Last Updated: December 20, 2025
Branch Lake, located in Ellsworth, Maine, is a picturesque water resource managed by the local government with a primary purpose of hydroelectric power generation.
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Summary
The dam at Branch Lake, completed in 1911, stands at a height of 15 feet and has a storage capacity of 18,100 acre-feet. The lake serves multiple purposes including fire protection, recreation, and water supply for the surrounding area.
With a fair condition assessment and significant hazard potential, Branch Lake is closely monitored with inspections every 6 years to ensure its safety and functionality. The dam, primarily a rockfill type, spans 294 feet in length and has a spillway width of 90 feet. This vital water source also supports a variety of activities such as fishing, boating, and wildlife conservation in the region.
As a key feature in the local landscape, Branch Lake Stream feeds into Branch Lake and plays a crucial role in flood risk reduction and maintaining water quality. The lake's association with hydroelectric power generation underscores its importance in sustainable energy production and resource management in the region. With its rich history and diverse ecosystem, Branch Lake remains a valuable asset for both water resource and climate enthusiasts to explore and appreciate.
Year Completed |
1911 |
Dam Length |
294 |
Dam Height |
15 |
River Or Stream |
Branch Lake Stream |
Primary Dam Type |
Rockfill |
Surface Area |
2703 |
Hydraulic Height |
14 |
Drainage Area |
31 |
Nid Storage |
18100 |
Structural Height |
15 |
Hazard Potential |
Significant |
Nid Height |
15 |
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.
Branch Lake