Shepaug Reservoir Report

Last Updated: December 5, 2025

Shepaug is a captivating hydroelectric dam located in Berkshire Estates, Connecticut, along the picturesque Housatonic River.


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Summary

Built in 1955, this concrete gravity dam stands at 138 feet tall and stretches 1412 feet in length, boasting a storage capacity of 72,700 acre-feet and a normal storage of 66,700 acre-feet. With a maximum discharge capacity of 162,000 cubic feet per second, Shepaug plays a crucial role in generating hydroelectric power while also providing recreational opportunities for the surrounding community.

Managed by the Federal Energy Regulatory Commission, Shepaug is classified as having a high hazard potential due to its structural characteristics and location. The dam features a controlled spillway with a width of 293 feet and is equipped with five Tainter radial gates for efficient water management. Despite its age, Shepaug's condition assessment is marked as "Not Available," underscoring the importance of regular inspections and maintenance to ensure its continued safe operation. Additionally, an Emergency Action Plan (EAP) has been prepared and last revised in January 2021 to address potential risks and ensure swift response in case of emergencies.

With a risk assessment rating of "Very High (1)," Shepaug serves as a vital water resource and energy infrastructure in the region, highlighting the intricate balance between harnessing the power of water for electricity generation and safeguarding against potential risks to the environment and surrounding communities. As a beloved landmark in New Haven County, Connecticut, Shepaug stands as a testament to human ingenuity in harnessing the forces of nature while also underscoring the need for vigilant monitoring and proactive risk management in the face of climate variability and changing environmental conditions.

Year Completed

1955

Dam Length

1412

Dam Height

138

River Or Stream

Housatonic River

Primary Dam Type

Concrete

Surface Area

1870

Drainage Area

1391

Nid Storage

72700

Outlet Gates

Tainter (radial) - 5

Hazard Potential

High

Foundations

Rock

Nid Height

138
       
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.