Donegal Reservoir Report

Last Updated: December 5, 2025

Located in Donegal Township, Pennsylvania, the Donegal dam is a state-regulated structure under the jurisdiction of the Pennsylvania Department of Environmental Protection.


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Summary

Built in 1967 for recreational purposes, this earth dam stands at a height of 32 feet and has a length of 520 feet, creating a storage capacity of 1650 acre-feet with a normal storage level of 900 acre-feet. The dam overlooks the picturesque Fourmile Run, enhancing the surrounding area's natural beauty and providing a haven for outdoor enthusiasts.

Despite its satisfactory condition assessment, the Donegal dam poses a high hazard potential, prompting regular inspections to ensure its structural integrity and safety. In 2020, the dam underwent modifications to its foundation, hydraulic systems, and other components, reflecting a commitment to maintaining and improving its functionality. With its strategic location and vital role in water resource management, the Donegal dam serves as a focal point for safeguarding the environment and enhancing recreational opportunities in Westmoreland County, Pennsylvania.

As climate change continues to impact water resources and infrastructure across the globe, the Donegal dam stands as a crucial element in the region's resilience and adaptation strategies. With its proximity to the Baltimore District and the support of state agencies, the dam represents a collaborative effort to balance environmental protection, public safety, and recreational enjoyment. As water resource and climate enthusiasts explore the intricate relationship between dams, rivers, and ecosystems, the Donegal dam emerges as a symbol of sustainable water management and community engagement in the face of evolving environmental challenges.

Years Modified

2020 - Foundation, 2020 - Hydraulic, 2020 - Other

Year Completed

1967

Dam Length

520

Dam Height

32

River Or Stream

FOURMILE RUN

Primary Dam Type

Earth

Surface Area

90

Drainage Area

5.9

Nid Storage

1650

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

32
       
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.
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Area Campgrounds