H A Stewart Reservoir Report

Last Updated: December 5, 2025

H A Stewart, also known as Latrobe Reservoir, is a significant water supply dam located in Ligonier Township, Pennsylvania.


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Summary

Built in 1920, this earth dam stands at a height of 86 feet and spans 600 feet in length, providing a storage capacity of 6250 acre-feet. The reservoir serves the primary purpose of water supply and is regulated by the Pennsylvania Department of Environmental Protection, ensuring its safety and compliance with state standards.

Situated on Trout Run in Westmoreland County, H A Stewart plays a crucial role in managing water resources for the surrounding area. With a drainage area of 5.66 square miles and a normal storage capacity of 3650 acre-feet, this dam contributes to the local ecosystem and supports the community's water needs. Despite being classified as having a high hazard potential, the dam's condition assessment is rated as fair, indicating a need for ongoing monitoring and maintenance to ensure its continued safety and functionality.

As a key infrastructure owned by the local government, H A Stewart stands as a testament to the importance of water resource management in mitigating the impacts of climate change. With its historical significance and vital role in providing water for the region, this dam serves as a reminder of the interconnectedness between water resources, climate resilience, and community well-being.

Year Completed

1920

Dam Length

600

Dam Height

86

River Or Stream

TROUT RUN

Primary Dam Type

Earth

Surface Area

136

Drainage Area

5.66

Nid Storage

6250

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

86
       
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.