Haviland Millpond Dam Reservoir Report

Last Updated: December 5, 2025

Haviland Millpond Dam, located in Sherman, Connecticut, is a picturesque masonry dam completed in 1920 primarily for recreational purposes.


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Summary

The dam stands at a height of 12 feet and has a length of 110 feet, creating a peaceful millpond with a storage capacity of 76 acre-feet and a surface area of 17 acres. Despite its low hazard potential, the dam is state-regulated and subject to regular inspections, permitting, and enforcement by the Connecticut Department of Energy and Environmental Protection (DEEP).

The dam's condition is currently not rated, and there is no Emergency Action Plan (EAP) in place. However, with an inspection frequency of 10 years and no significant modifications reported, the risk of failure is considered low. Moreover, the dam does not fall under the jurisdiction of the US Army Corps of Engineers, indicating that its management and operations are solely the responsibility of the private owner. For water resource and climate enthusiasts, Haviland Millpond Dam offers a serene setting to appreciate the intersection of human infrastructure with natural water systems and the importance of responsible dam maintenance in ensuring safety and sustainability.

Year Completed

1920

Dam Length

110

Dam Height

12

Primary Dam Type

Masonry

Surface Area

17

Drainage Area

0.32

Nid Storage

76

Hazard Potential

Low

Nid Height

12
       
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.