Turkey Hill Reservoir Dam & Dike Reservoir Report

Last Updated: December 5, 2025

The Turkey Hill Reservoir Dam & Dike in Middlesex, Connecticut, is a vital piece of infrastructure designed to provide water supply for the region.


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Summary

Owned by a public utility, the dam and dike are regulated by the Connecticut Department of Energy and Environmental Protection (DEEP). The primary purpose of this earth dam is to ensure a steady water supply for the area, with a capacity to store 0 acre-feet of water and covering a surface area of 78 acres.

However, recent inspections have raised concerns about the condition of the dam, with a poor assessment and significant hazard potential. The last inspection in October 2019 highlighted the need for maintenance and repairs to ensure the safety and functionality of the structure. With a spillway width of 100 feet and a height of 10 feet, the Turkey Hill Reservoir Dam & Dike plays a critical role in managing water resources in the area, making it essential to address these maintenance issues promptly.

As climate change continues to impact water resources and infrastructure, the Turkey Hill Reservoir Dam & Dike serves as a reminder of the importance of maintaining and monitoring these structures. With a risk assessment and management measures yet to be fully defined, it is crucial for authorities to prioritize the safety and integrity of this dam to avoid potential hazards and ensure the continued supply of water to the community.

Dam Length

840

Dam Height

10

River Or Stream

GREAT BROOK

Primary Dam Type

Earth

Surface Area

78

Drainage Area

1.24

Hazard Potential

Significant

Nid Height

10
       
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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