Dark Hollow, located in Wayne Township, Pennsylvania, is a local government-owned Earth dam completed in 1934 for recreational purposes. Standing at 44 feet tall and stretching 240 feet in length, this structure impounds Dark Hollow Run and offers a storage capacity of 10.8 acre-feet. Despite its fair condition assessment and high hazard potential, the dam is regulated by the Pennsylvania Department of Environmental Protection and undergoes regular inspections, with the last one conducted in November 2019.

With a surface area of 0.52 acres and a drainage area of 0.5 square miles, Dark Hollow Dam serves as a recreational hub for the community while also posing a moderate risk level. The spillway, designed as uncontrolled with a width of 20 feet, ensures the safe discharge of excess water. Although no associated structures are present, the dam's location within Mifflin County makes it a vital resource for water enthusiasts and climate advocates alike. Despite its age, Dark Hollow Dam continues to provide essential functions and recreational opportunities within the region.

As climate change impacts water resources, the presence of structures like Dark Hollow Dam becomes crucial for managing flood risks and ensuring water availability for various uses. The dam's significance extends beyond its recreational value, highlighting the intricate balance between human intervention and environmental stewardship. With ongoing regulatory oversight and maintenance, Dark Hollow Dam stands as a testament to the intersection of water management, climate resilience, and community recreation in Pennsylvania's landscape.