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