Shepaug Reservoir Dam Reservoir Report

Last Updated: December 6, 2025

Shepaug Reservoir Dam, also known as Lower Shepaug Reservoir, is a concrete dam located in Woodville, Connecticut.


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Summary

Built in 1933, this dam serves as a vital water supply infrastructure for the region, with a storage capacity of 2937 acre-feet and a surface area of 112 acres. The dam stands at a height of 65 feet and stretches 500 feet in length, harnessing the waters of the Shepaug River to meet the community's water needs.

Managed by the local government and regulated by the Connecticut Department of Energy and Environmental Protection (DEEP), Shepaug Reservoir Dam has a high hazard potential but is currently assessed to be in satisfactory condition. With a spillway width of 73 feet and a maximum discharge capacity of 18,725 cubic feet per second, the dam plays a crucial role in mitigating flood risks and ensuring water supply stability. Despite its age, the dam has undergone regular inspections and maintenance to uphold its structural integrity and operational effectiveness.

Located in Litchfield County, Shepaug Reservoir Dam is a key component of Connecticut's water resource infrastructure, providing essential services for the surrounding communities. As climate change continues to impact water availability and quality, the maintenance and management of dams like Shepaug are essential for safeguarding water resources and adapting to evolving climate conditions. With a moderate risk assessment rating and a history of satisfactory performance, Shepaug Reservoir Dam stands as a testament to the importance of resilient water infrastructure in the face of changing environmental challenges.

Year Completed

1933

Dam Length

500

Dam Height

65

River Or Stream

SHEPAUG RIVER

Primary Dam Type

Concrete

Surface Area

112

Drainage Area

38.2

Nid Storage

2937

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

65
       
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.