Long Pine Run Reservoir Report

Last Updated: December 5, 2025

Long Pine Run is a vital water supply dam located in Franklin Township, Adams County, Pennsylvania.


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Summary

Completed in 1970, this earth dam stands at a height of 112 feet and spans 840 feet in length, with a storage capacity of 7490 acre-feet. The dam serves as a critical resource for the surrounding community, with a normal storage capacity of 5430 acre-feet, covering a surface area of 150 acres and draining an area of 7.92 square miles.

Maintained and regulated by the Pennsylvania Department of Environmental Protection, Long Pine Run is classified as a high hazard potential dam with a fair condition assessment. The dam is regularly inspected, with the most recent inspection conducted in March 2021 to ensure its structural integrity and safety. While the dam has not undergone any modifications in recent years, it remains a key component of the water supply infrastructure in the region, providing essential resources for both domestic and agricultural purposes.

Water resource and climate enthusiasts will appreciate the significance of Long Pine Run in sustaining the local ecosystem and community. As a primary water supply source, this dam plays a crucial role in ensuring water availability and security for residents in Adams County. With its impressive storage capacity and strategic location along Birch Run, Long Pine Run stands as a testament to the importance of infrastructure management and regulatory oversight in safeguarding water resources for future generations.

Year Completed

1970

Dam Length

840

Dam Height

112

River Or Stream

BIRCH RUN

Primary Dam Type

Earth

Surface Area

150

Drainage Area

7.92

Nid Storage

7490

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

112
       
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.