Mill is a privately owned earth dam located in North Codorus Township, York, Pennsylvania, along the Codorus Creek. Built in 1863 for grade stabilization purposes, this structure stands at a height of 18 feet and spans a length of 250 feet, with a storage capacity of 589 acre-feet. The dam is under the regulatory oversight of the Pennsylvania Department of Environmental Protection, with state permitting, inspection, and enforcement in place to ensure its safety and compliance with regulations.

With a high hazard potential but a satisfactory condition assessment, Mill has been regularly inspected, with the most recent inspection conducted in December 2020. The dam has a normal storage capacity of 34 acre-feet and serves a drainage area of 73.4 square miles. Despite being over a century old, the structure has undergone modifications in 2005 to ensure its continued functionality. The dam's location in a picturesque setting along the Codorus Creek adds to its historical significance and importance in the local water resource management system.