Alder Brook Reservoir Report
Nearby: Arnold Brook Mapleton
Last Updated: December 19, 2025
Alder Brook is a vital water resource in Aroostook, Maine, serving as a flood risk reduction measure since its completion in 1973.
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Summary
Owned and regulated by the local government with oversight from the Maine Emergency Management Agency, this earth dam stands at a height of 35 feet and spans a length of 1075 feet. With a normal storage capacity of 250 acre-feet and a maximum storage of 2750 acre-feet, Alder Brook covers an area of 16 acres and drains a watershed of 15 square miles.
Managed by the Natural Resources Conservation Service, Alder Brook is designed to withstand low hazard potential with a focus on flood risk reduction. The dam's hydraulic height reaches 33 feet, ensuring efficient water control and management during times of increased discharge. Although not rated for condition assessment, Alder Brook's inspective frequency of 12 months guarantees ongoing monitoring and maintenance to uphold its structural integrity and functionality. With its primary purpose being flood risk reduction, Alder Brook plays a crucial role in safeguarding the local community and surrounding areas from potential water-related hazards.
Year Completed |
1973 |
Dam Length |
1075 |
Dam Height |
35 |
River Or Stream |
Alder Brook |
Primary Dam Type |
Earth |
Surface Area |
16 |
Hydraulic Height |
33 |
Drainage Area |
15 |
Nid Storage |
2750 |
Structural Height |
35 |
Hazard Potential |
Low |
Nid Height |
35 |
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.
Alder Brook
Niles Road 38, Presque Isle