Reynoldsville Storage #4 is a critical water supply structure located in Winslow Township, Jefferson County, Pennsylvania. Owned by the local government, this earth dam was completed in 1961 and stands at a height of 16 feet with a length of 275 feet. The dam has a storage capacity of 23 acre-feet and serves the primary purpose of water supply for the surrounding area.

Situated on Pitchpine Run and regulated by the Pennsylvania Department of Environmental Protection, Reynoldsville Storage #4 has a high hazard potential and is classified as being in fair condition. The dam's inspection frequency is once a year, with the last inspection conducted in October 2020. While the structure meets state regulatory requirements for permitting, inspection, and enforcement, there are currently no emergency action plans in place.

For water resource and climate enthusiasts, Reynoldsville Storage #4 presents an intriguing case study in dam management and risk assessment. With its historical significance and vital role in supplying water to the region, this earth dam serves as a focal point for understanding the complexities of maintaining and safeguarding water resources in a changing climate landscape.