Mirimichi Pond Spillway Reservoir Report

Last Updated: January 13, 2026

Mirimichi Pond Spillway, located in Foxborough, Massachusetts, is a significant water supply dam completed in 1926 with a height of 13 feet and a hydraulic height of 8.5 feet.


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Summary

It serves the primary purpose of water supply, with a storage capacity of 845 acre-feet and a normal storage of 460 acre-feet. The spillway type is uncontrolled, and the dam spans 385 feet in length, regulating the flow of the Wading River.

Managed by the Department of Conservation and Recreation, the Mirimichi Pond Spillway is state-regulated, permitted, inspected, and enforced, ensuring compliance with safety standards and regulations. The dam is classified as having a fair condition assessment with a significant hazard potential, requiring a moderate risk management approach. Despite its age, the dam continues to provide essential water supply services to the surrounding area, demonstrating the resilience and functionality of this earth dam structure.

With Congressman Joseph P. Kennedy III representing the area in Congress, the Mirimichi Pond Spillway stands as a vital infrastructure for water resource management in Norfolk County, Massachusetts. Its strategic location and historical significance make it a noteworthy site for water resource and climate enthusiasts interested in the intersection of infrastructure, environmental conservation, and community resilience.

Year Completed

1926

Dam Length

385

Dam Height

13

River Or Stream

WADING RIVER

Primary Dam Type

Earth

Surface Area

154

Hydraulic Height

8.5

Drainage Area

12.05

Nid Storage

845

Hazard Potential

Significant

Foundations

Unlisted/Unknown

Nid Height

13
       
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.