Mclean Reservoir Dam Reservoir Report

Last Updated: December 7, 2025

Located in Hampden, Massachusetts, the Mclean Reservoir Dam is a vital structure managed by the local government for water supply purposes.


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Summary

With a height of 35 feet and a hydraulic height of 31.8 feet, this earth dam serves as a key component in the water management infrastructure of the region. Completed in 1903, the dam has a storage capacity of 1,240 acre-feet and covers a surface area of 59 acres, drawing water from a tributary to Paucatuck Brook.

Regulated by the Department of Conservation and Recreation in Massachusetts, the Mclean Reservoir Dam has a significant hazard potential but is currently assessed as satisfactory in condition. Its spillway type is uncontrolled, with a spillway width of 0 feet. With a moderate risk assessment rating of 3, the dam undergoes inspections every 5 years to ensure its integrity and safety. Despite its age, the Mclean Reservoir Dam continues to play a crucial role in providing water to the surrounding communities, highlighting the importance of proper maintenance and oversight in water resource management.

Year Completed

1903

Dam Length

700

Dam Height

35

River Or Stream

TRIBUTARY TO PAUCATUCK BROOK

Primary Dam Type

Earth

Surface Area

59

Hydraulic Height

31.8

Drainage Area

0.43

Nid Storage

1240

Hazard Potential

Significant

Foundations

Unlisted/Unknown

Nid Height

35
       
Seasonal Comparison

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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.