Keystone State Park Reservoir Report

Last Updated: December 5, 2025

Keystone State Park, located in Derry Township, Pennsylvania, is a recreational haven nestled along the picturesque McCune Run.


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Summary

The park boasts a beautiful earth dam, standing at 45 feet tall and stretching 680 feet in length, completed in 1910. With a storage capacity of 1250 acre-feet and a surface area of 78 acres, Keystone State Park provides ample opportunities for outdoor enthusiasts to enjoy activities such as fishing, boating, and picnicking in a serene natural setting.

Managed by the Pennsylvania Department of Environmental Protection, Keystone State Park is regulated, permitted, inspected, and enforced by state agencies to ensure the safety and sustainability of the dam and surrounding area. The dam, with a significant hazard potential, underwent structural modifications in 2006 and hydraulic modifications in 2008. Despite its age, the dam's condition assessment is currently not rated, highlighting the importance of continued monitoring and maintenance to mitigate any potential risks and ensure the safety of visitors and the surrounding community.

For water resource and climate enthusiasts, Keystone State Park offers a fascinating glimpse into the intersection of environmental conservation and recreational enjoyment. With its rich history, stunning natural beauty, and commitment to safety and regulation, the park serves as a valuable resource for both locals and visitors seeking a tranquil escape into nature while also raising awareness of the importance of responsible stewardship of water resources in a changing climate.

Years Modified

2006 - Structural, 2008 - Hydraulic

Year Completed

1910

Dam Length

680

Dam Height

45

River Or Stream

MCCUNE RUN

Primary Dam Type

Earth

Surface Area

78

Drainage Area

3.5

Nid Storage

1250

Hazard Potential

Significant

Foundations

Unlisted/Unknown

Nid Height

45
       
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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