Hallmere Reservoir Dam Reservoir Report

Last Updated: December 5, 2025

Hallmere Reservoir Dam, located in Kensington, Connecticut, is a vital water supply infrastructure owned by the local government.


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Summary

Built in 1897, this earth dam stands at a height of 45 feet and spans a length of 600 feet, with a storage capacity of 585 acre-feet. The reservoir covers an area of 18.4 acres and is fed by the John Hall Brook, serving as a crucial source of water for the region.

Maintained and regulated by the Connecticut Department of Energy and Environmental Protection (DEEP), Hallmere Reservoir Dam is classified as having a high hazard potential but is currently in satisfactory condition according to a 2015 assessment. The dam has a spillway width of 30 feet and a maximum discharge capacity of 1470 cubic feet per second, ensuring effective flood control measures. Despite its age, the dam undergoes regular inspections every two years to ensure its structural integrity and safety.

With its rich history dating back over a century and its strategic importance in water resource management, Hallmere Reservoir Dam serves as a testament to the enduring legacy of infrastructure projects in sustaining communities and ecosystems. As climate change poses new challenges to water availability and quality, the continued operation and maintenance of dams like Hallmere Reservoir Dam are essential in ensuring the resilience of our water supply systems in the face of evolving environmental conditions.

Year Completed

1897

Dam Length

600

Dam Height

45

River Or Stream

JOHN HALL BROOK

Primary Dam Type

Earth

Surface Area

18.4

Drainage Area

1.1

Nid Storage

585

Hazard Potential

High

Nid Height

45
       
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.