Conemaugh Dam Reservoir Report

Last Updated: December 5, 2025

Conemaugh Dam, also known as Conemaugh River Lake, is a federal-owned structure located in Westmoreland, Pennsylvania, along the Conemaugh River.


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Summary

Completed in 1952, this gravity dam stands at a structural height of 144 feet and has a hydraulic height of 136 feet. With a maximum storage capacity of 355,000 acre-feet and a normal storage of 5,140 acre-feet, the dam primarily serves the purpose of flood risk reduction, while also supporting hydroelectric power generation, recreation, and other uses.

Managed by the US Army Corps of Engineers, Conemaugh Dam is equipped with a controlled spillway and outlet gates to regulate water levels and discharge. Classified as having a high hazard potential, the dam is subject to regular inspections and risk assessments to ensure its safety and stability. The USACE implements various risk management measures, including ongoing monitoring, maintenance, and collaboration with local emergency managers to prepare for potential dam-related emergencies. Despite its flood risk reduction capabilities, the dam's capacity to store water is limited, and extreme weather events can lead to controlled releases or even structural issues if overwhelmed.

In light of the dam's critical role in managing flood risk in the region, ongoing efforts are underway to enhance its resilience and effectiveness. The USACE is committed to addressing all types of flood risk associated with Conemaugh Dam, while also engaging with the public and emergency responders to promote awareness and preparedness. As part of an evolving risk management strategy, the dam's emergency action plan is regularly updated, and measures are taken to ensure its continued operation and safety.

Year Completed

1952

Dam Length

1266

River Or Stream

CONEMAUGH RIVER

Primary Dam Type

Gravity

Surface Area

800

Hydraulic Height

136

Drainage Area

1351

Nid Storage

355000

Structural Height

144

Outlet Gates

Tainter (radial) - 26, Vertical Lift - 14

Hazard Potential

High

Foundations

Rock

Nid Height

144
       
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.