Killingly Pond Dam Reservoir Report

Last Updated: December 5, 2025

Killingly Pond Dam, located in Killingly, Connecticut, serves as a crucial structure regulating the flow of Whetstone Brook.


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Summary

Built in 1900, this masonry dam stands at a height of 15 feet and spans a length of 274 feet, with a storage capacity of 715 acre-feet. The dam is classified as having a "Significant" hazard potential and is deemed to be in "Fair" condition based on a 2019 assessment.

With a maximum discharge capacity of 30 cubic feet per second, Killingly Pond Dam plays a vital role in managing water resources and mitigating flood risks in the region. The dam is under state jurisdiction and regulation, with inspections conducted every five years to ensure its structural integrity and functionality. Despite its age, the dam continues to operate effectively, showcasing its importance in safeguarding the surrounding community and environment.

As a key component of the local water infrastructure, Killingly Pond Dam stands as a testament to the engineering feats of the past while serving as a reminder of the ongoing need for sustainable water resource management in the face of climate change. The dam's very high risk assessment rating underscores the critical role it plays in protecting lives and property from potential flooding events. As water resource and climate enthusiasts, understanding and supporting structures like Killingly Pond Dam is essential in ensuring the resilience of our communities in the face of evolving environmental challenges.

Year Completed

1900

Dam Length

274

Dam Height

15

River Or Stream

WHETSTONE BROOK

Primary Dam Type

Masonry

Surface Area

150

Drainage Area

1.51

Nid Storage

715

Hazard Potential

Significant

Nid Height

15
       
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.