Orono Reservoir Report
Nearby: Gilman Mill Leonards Mill
Last Updated: December 20, 2025
Orono, located in Penobscot County, Maine, is home to the Stillwater River hydroelectric dam, which was completed in 1917.
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Summary
This concrete dam stands at a height of 15 feet and has a length of 1178 feet, providing a storage capacity of 1300 acre-feet. The dam serves multiple purposes, including hydroelectric power generation and recreation, with a spillway width of 617 feet for uncontrolled discharge.
Managed by the Federal Energy Regulatory Commission, Orono's dam has a low hazard potential and a moderate risk assessment score of 3. While the condition assessment is not available, regular inspections are conducted every three years to ensure the safety and functionality of the structure. The dam's location on the Stillwater River contributes to its vital role in water resource management within the region, showcasing the intersection of sustainable energy production and environmental stewardship in the face of climate challenges.
With a long history of providing clean energy and recreational opportunities, Orono's hydroelectric dam stands as a testament to the innovation and foresight in harnessing water resources for the benefit of the community. As climate enthusiasts, the integration of renewable energy sources like hydropower in Orono highlights the importance of sustainable practices in mitigating the impacts of climate change on water resources and ecosystems. The continued oversight and management of Orono's dam underscore the commitment to balancing development with environmental protection, creating a model for responsible water resource utilization in the face of evolving climate conditions.
Year Completed |
1917 |
Dam Length |
1178 |
Dam Height |
15 |
River Or Stream |
Stillwater River |
Primary Dam Type |
Concrete |
Surface Area |
175 |
Drainage Area |
7710 |
Nid Storage |
1300 |
Hazard Potential |
Low |
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.
Area Campgrounds
| Location | Reservations | Toilets |
|---|---|---|
Cold River Campground
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Paul Bunyan Campground
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Star Rock Campsite
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Orono
Fourth Street 22, Old Town