Malletts Mill Reservoir Report
Nearby: Village Dwinal Pond
Last Updated: December 26, 2025
Malletts Mill, located in Penobscot, Maine, is a privately owned earth dam constructed in 1836 on the Mattakeunk River.
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Summary
This dam serves multiple purposes including fire protection, stock, and small fish pond management. With a height of 16 feet and a hydraulic height of 14 feet, Malletts Mill has a storage capacity of 108 acre-feet, with a normal storage level of 72 acre-feet. The dam has a surface area of 28 acres and drains an area of 11.6 square miles.
Despite its historical significance, Malletts Mill is currently classified as having a significant hazard potential and poor condition assessment. The last inspection in May 2020 revealed the dam's deteriorating state, prompting concern for its structural integrity. The dam is regulated by the Maine Emergency Management Agency (MEMA) and undergoes regular inspections, but there is a need for further risk assessment and management measures to ensure the safety of the surrounding community and water resources. As climate change continues to impact water levels and extreme weather events, the resilience of dams like Malletts Mill becomes increasingly crucial for mitigating potential disasters and protecting the environment.
Year Completed |
1836 |
Dam Length |
300 |
Dam Height |
16 |
River Or Stream |
Mattakeunk |
Primary Dam Type |
Earth |
Surface Area |
28 |
Hydraulic Height |
14 |
Drainage Area |
11.6 |
Nid Storage |
108 |
Structural Height |
16 |
Hazard Potential |
Significant |
Nid Height |
16 |
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.
Malletts Mill