Elmville Dam Reservoir Report

Last Updated: December 5, 2025

Elmville Dam, also known as Elmville Pond, is a local government-owned structure located in Killingly, Connecticut.


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Summary

Completed in 1900, this earth dam spans 200 feet in length and stands at a height of 7 feet, with a maximum storage capacity of 26 acre-feet. The primary purpose of Elmville Dam is for recreation, offering a surface area of 1.8 acres and serving as a popular spot for outdoor activities such as fishing and boating.

Managed by the Connecticut Department of Energy and Environmental Protection (DEEP), Elmville Dam is regulated, permitted, inspected, and enforced by the state agency to ensure its safety and compliance with regulations. The dam's hazard potential is classified as significant, with a fair condition assessment as of the last inspection in September 2014. While there are no associated locks or outlet gates, the dam has a spillway width of 90 feet and a maximum discharge capacity of 3000 cubic feet per second.

Water resource and climate enthusiasts visiting Elmville Dam can appreciate its scenic location along Whetstone Brook in Windham County. With its rich history dating back over a century, Elmville Dam provides both recreational opportunities and important water management functions within the region. The dam continues to be a focal point for outdoor enjoyment and serves as a reminder of the vital role dams play in supporting local ecosystems and communities.

Year Completed

1900

Dam Length

200

Dam Height

7

River Or Stream

WHETSTONE BROOK

Primary Dam Type

Earth

Surface Area

1.8

Drainage Area

13.9

Nid Storage

26

Hazard Potential

Significant

Nid Height

7
       
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.