Conant Brook Dam Reservoir Report

Last Updated: December 7, 2025

Conant Brook Dam, also known as Dry Reservoir, is a gravity dam located in Monson, Massachusetts, designed and managed by the US Army Corps of Engineers.


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Summary

Completed in 1966, the dam stands at a height of 85 feet and has a storage capacity of 5400 acre-feet, with a maximum discharge capacity of 10750 cubic feet per second. The primary purpose of the dam is flood risk reduction along the Conant Brook river.

With a high hazard potential, the dam is continuously monitored by the USACE to address all types of flood risk associated with it. Management measures include regular inspections, maintenance, and repairs to ensure the dam's structural integrity and readiness for potential emergencies. The USACE works closely with local emergency managers and the public to raise awareness and support actions for emergency preparedness and response. More detailed information regarding the dam's risk assessment and management strategies will be provided in the future, emphasizing the importance of proactive measures in mitigating potential risks associated with severe weather events and water level fluctuations.

Year Completed

1966

Dam Length

900

Dam Height

85

River Or Stream

CONANT BROOK

Primary Dam Type

Gravity

Surface Area

1

Hydraulic Height

80

Drainage Area

8

Nid Storage

5400

Structural Height

85

Outlet Gates

Uncontrolled - 0

Hazard Potential

High

Foundations

Rock

Nid Height

85
       
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.