Wyman Pond Compensating Reservoir Dam Reservoir Report

Last Updated: December 12, 2025

Wyman Pond Compensating Reservoir Dam, located in Westminster, Massachusetts, was completed in 1892 and serves as a crucial water supply resource in the region.


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Summary

This concrete dam stands at a height of 24.7 feet, with a hydraulic height of 19 feet, and has a storage capacity of 2388 acre-feet. It spans 250 feet in length and covers a surface area of 200.3 acres, with a drainage area of 7.89 square miles. The dam is regulated by the Department of Conservation and Recreation in Massachusetts and is categorized as a high hazard potential structure.

Despite its age, the Wyman Pond Compensating Reservoir Dam is deemed to be in satisfactory condition as of the last assessment in April 2017. The dam's emergency action plan was last revised in June 2016, with a moderate risk assessment rating of 3. It is subject to regular inspections every two years to ensure its structural integrity and safety measures are up to standards. The dam's primary purpose of water supply underscores its vital role in sustaining the surrounding communities, highlighting the importance of maintaining and monitoring its operations effectively for the foreseeable future.

Year Completed

1892

Dam Length

250

Dam Height

24.7

River Or Stream

SMITH BROOK

Primary Dam Type

Concrete

Surface Area

200.3

Hydraulic Height

19

Drainage Area

7.89

Nid Storage

2388

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

25
       
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.