Lake Konomoc Dike Reservoir Report

Last Updated: December 5, 2025

Lake Konomoc Dike, located in Montville, Connecticut, is a crucial structure that regulates the flow and storage of water in the Lake Konomoc area.


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Summary

Owned by a public utility, this earth dam stands at a height of 8 feet and stretches for 350 feet, primarily made of stone with a foundation of rock and soil. The dam plays a vital role in the state's water resource management, as it is regulated, permitted, and inspected by the Connecticut Department of Energy and Environmental Protection (DEEP).

Despite its fair condition assessment in 2019, Lake Konomoc Dike poses a high hazard potential, prompting a frequent inspection schedule of every two years. The dam features controlled outlet gates but lacks a spillway, making its risk management measures a critical aspect of its operation. With a high-risk assessment and hazard potential, the dam serves as a key component in the overall water management strategy for the region, ensuring the safety and sustainability of the surrounding area's water resources.

Enthusiasts of water resources and climate will find Lake Konomoc Dike's structural details and risk assessment intriguing, highlighting the importance of maintaining and managing essential infrastructure for water regulation and flood control. As a significant element in Connecticut's water resource management system, the dam's condition and inspection frequency underscore the ongoing efforts to safeguard the region against potential hazards and ensure the sustainable use of water resources in the area.

Dam Length

350

Dam Height

8

River Or Stream

LAKE KONOMOC

Primary Dam Type

Earth

Outlet Gates

Other Controlled

Hazard Potential

High

Foundations

Rock, Soil

Nid Height

8
       
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.
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Area Campgrounds