Chalkers Millpond Dam Reservoir Report

Last Updated: December 5, 2025

Chalkers Millpond Dam, located in Old Saybrook, Connecticut, is a historic structure completed in 1845 for the primary purpose of recreation.


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Summary

The dam, situated on the Oyster River, stands at a height of 4 feet and spans 300 feet in length. With a storage capacity of 55 acre-feet and a surface area of 11.1 acres, the dam provides essential water resources for the surrounding area.

Despite its historical significance and recreational value, the dam is currently assessed to be in poor condition, with a significant hazard potential. The last inspection in 2014 revealed the need for improvements to ensure the safety and integrity of the structure. With its association with the Department of Energy and Environmental Protection (DEEP) as the state regulatory agency, efforts are being made to address the dam's maintenance and enforcement needs to mitigate any potential risks and ensure the safety of the surrounding community and environment.

As a vital water resource in Middlesex County, Connecticut, Chalkers Millpond Dam serves as a focal point for water enthusiasts and climate advocates. With its rich history and importance for recreation, efforts to improve the dam's condition and enhance its safety measures are crucial for preserving this valuable asset for future generations.

Year Completed

1845

Dam Length

300

Dam Height

4

River Or Stream

OYSTER RIVER

Surface Area

11.1

Drainage Area

1.62

Nid Storage

55

Hazard Potential

Significant

Nid Height

4
       
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.