Mill Pond Reservoir Report

Last Updated: December 19, 2025

Mill Pond, located in Knox, Maine, is a captivating fish and wildlife pond with a rich history dating back to its completion in 1920.


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Summary

This private concrete dam stands at a height of 15 feet, providing a storage capacity of 210 acre-feet and a surface area of 33 acres. The pond serves as a recreational spot and a haven for various wildlife species, making it an essential resource for the local ecosystem.

Maintained and regulated by the Maine Emergency Management Agency (MEMA), Mill Pond has a low hazard potential and is inspected regularly to ensure its structural integrity. With a spillway width of 10 feet and a drainage area of zero, the pond's primary purpose is to support fish and wildlife populations in the area. Additionally, the dam's location near Allen Brook adds to its natural beauty and ecological significance, attracting water resource and climate enthusiasts to enjoy its peaceful surroundings and diverse wildlife.

As a cherished feature in the New England District, Mill Pond continues to provide a vital habitat for various species while offering recreational opportunities for visitors. Its historical significance, combined with its role in supporting local biodiversity, makes it a valuable asset for both the community and the environment. With proper management and maintenance, Mill Pond stands as a beacon of conservation and enjoyment for all who appreciate the intersection of water resources and climate preservation.

Year Completed

1920

Dam Length

40

Dam Height

15

River Or Stream

Allen Brook

Primary Dam Type

Concrete

Surface Area

33

Hydraulic Height

15

Nid Storage

210

Structural Height

15

Hazard Potential

Low

Nid Height

15
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.