Mars Hill Reservoir Report
Nearby: Robinson Youngs Lake
Last Updated: December 19, 2025
Mars Hill, located in Aroostook, Maine, boasts a concrete dam standing at a height of 14 feet with a hydraulic height of 10 feet and a length of 400 feet.
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Summary
Completed in the year 1900, this hydroelectric structure on Prestile Stream has a storage capacity of 160 acre-feet, providing vital water resources for the region. The dam serves multiple purposes including fire protection, stock, fish and wildlife habitat, flood risk reduction, hydroelectric power generation, and recreation.
Managed by the local government and regulated by the Maine Emergency Management Agency (MEMA), Mars Hill dam is deemed to have low hazard potential and is currently not rated for its condition assessment. The last inspection conducted in August 2013 confirmed its overall stability and functionality. With a spillway width of 96 feet and a surface area of 27 acres, the dam contributes to the ecological and economic well-being of the area by supporting various activities and habitats. While the dam may not be as large or high-profile as some others, its role in water resource management and climate adaptation in the region should not be underestimated.
Year Completed |
1900 |
Dam Length |
400 |
Dam Height |
14 |
River Or Stream |
Prestile Stream |
Primary Dam Type |
Concrete |
Surface Area |
27 |
Hydraulic Height |
10 |
Drainage Area |
75 |
Nid Storage |
160 |
Structural Height |
14 |
Hazard Potential |
Low |
Nid Height |
14 |
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.
Mars Hill