Dolby Reservoir Report
Nearby: East Millinocket Medway
Last Updated: December 21, 2025
Dolby, a hydroelectric dam located on the West Branch Penobscot River in East Millinocket, Maine, was completed in 1906 and stands at a height of 66 feet with a length of 1395 feet.
°F
°F
mph
Wind
%
Humidity
Summary
It serves multiple purposes including fish and wildlife pond management, flood risk reduction, navigation, recreation, and water supply. With a storage capacity of 41,956 acre-feet and a surface area of 2048 acres, Dolby plays a crucial role in managing water resources in the region.
Managed by the Federal Energy Regulatory Commission, Dolby has a controlled spillway with a width of 521 feet and is equipped with six slide gates for water control. The dam has a high hazard potential and is classified as very high risk, highlighting the need for effective risk management measures. Despite its age, Dolby continues to play a significant role in the local ecosystem and water infrastructure, reflecting the importance of sustainable water resource management in the face of changing climate patterns.
As a key player in the region's water management system, Dolby not only generates hydroelectric power but also contributes to the preservation of fish and wildlife habitats, flood protection, and recreational opportunities. Its location in Penobscot County, Maine, underscores the importance of sustainable water resource management in addressing the challenges posed by climate change. With its rich history and critical role in the local community, Dolby stands as a testament to the intersection of water resource management, climate resilience, and environmental stewardship.
Year Completed |
1906 |
Dam Length |
1395 |
Dam Height |
66 |
River Or Stream |
West Branch Penobscot River |
Surface Area |
2048 |
Drainage Area |
2108 |
Nid Storage |
41956 |
Outlet Gates |
Slide (sluice gate) - 6 |
Hazard Potential |
High |
Nid Height |
66 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
East Branch Penobscot River At Grindstone
|
943cfs |
Mattawamkeag River Near Mattawamkeag
|
1130cfs |
Penobscot River At West Enfield
|
16000cfs |
Piscataquis River At Medford
|
880cfs |
Seboeis River Near Shin Pond
|
156cfs |
Piscataquis River Near Dover-Foxcroft
|
2180cfs |
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.
Dolby
Medway Road Millinocket
Hay Brook To Bridge Above Medway At State Route 157