Trout Run Reservoir Report

Last Updated: December 5, 2025

Trout Run is a crucial water resource infrastructure located in Derry Township, Westmoreland County, Pennsylvania.


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Summary

This local government-owned dam was completed in 1927 with the primary purpose of water supply. With a height of 41 feet and a length of 582 feet, Trout Run has a storage capacity of 166 acre-feet, providing essential water resources to the surrounding area. The dam is state-regulated by the Pennsylvania Department of Environmental Protection, ensuring its compliance with safety and environmental standards.

Trout Run's earth dam type with a buttress core design poses a high hazard potential, although its current condition is assessed as fair. The dam undergoes regular inspections, with the last one conducted in December 2020. Despite its age, Trout Run continues to serve its intended purpose effectively, storing 98 acre-feet of water for normal use. The dam's location in the Baltimore District and its association with the Pennsylvania state agency highlight its significance in water resource management and climate resilience efforts in the region.

For water resource and climate enthusiasts, Trout Run stands as a testament to the importance of well-maintained infrastructure in ensuring water supply security. Its presence serves as a vital component of the local water system, contributing to the sustainability and resilience of the surrounding community. Monitoring Trout Run's condition, regulatory compliance, and emergency preparedness measures are essential aspects of ensuring the continued functionality and safety of this critical water resource infrastructure.

Year Completed

1927

Dam Length

582

Dam Height

41

River Or Stream

TROUT RUN

Primary Dam Type

Earth

Surface Area

8

Drainage Area

2.3

Nid Storage

166

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

41
       
Seasonal Comparison

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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.