Aziscohos Reservoir Report
Nearby: Abbott Brook Dike Upper Dam
Last Updated: December 19, 2025
Aziscohos, located in Oxford County, Maine, is a hydroelectric dam on the Magalloway River that was completed in 1911.
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Summary
With a height of 74 feet and a length of 880 feet, it has a storage capacity of 321,195 acre-feet and a normal storage of 220,000 acre-feet. The dam has a high hazard potential and a moderate risk assessment rating, making it a crucial structure for water resource management in the region.
Managed by the Federal Energy Regulatory Commission, Aziscohos plays a significant role in generating hydroelectric power while also providing flood control and water storage capabilities. The dam features a combination of buttress, earth, and gravity structures with a multi-arch core type, supported by rock and soil foundations. The spillway, with a width of 236 feet, is uncontrolled, and the dam is equipped with two other controlled outlet gates.
Despite its age, Aziscohos remains a key component of the local water infrastructure, ensuring the sustainable use of water resources in the area. Its strategic location and design make it a crucial asset for climate resilience efforts, highlighting the importance of effective dam management and maintenance in safeguarding against potential hazards and ensuring the continued availability of water for various purposes.
Year Completed |
1911 |
Dam Length |
880 |
Dam Height |
74 |
River Or Stream |
Magalloway River |
Surface Area |
8320 |
Drainage Area |
214 |
Nid Storage |
321195 |
Outlet Gates |
Other Controlled - 2 |
Hazard Potential |
High |
Foundations |
Rock, Soil |
Nid Height |
74 |
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.
Aziscohos