Basin 1, located in York Township, Pennsylvania, is a local government-owned earth dam designed for flood risk reduction on Mill Creek. Completed in 1998, this dam stands at a height of 13 feet and stretches 215 feet in length, with a storage capacity of 18.9 acre-feet. The Pennsylvania Department of Environmental Protection regulates this dam, ensuring its proper inspection, permitting, and enforcement to mitigate potential hazards.

Despite its satisfactory condition assessment, Basin 1 poses a high hazard potential due to its location and purpose. The dam has a designated inspection frequency, with the last inspection conducted in December 2020. While emergency action plans and risk assessments are not specified in the data, the structure's high hazard potential emphasizes the importance of preparedness and ongoing monitoring to safeguard against potential risks to downstream communities and the environment.

As a vital flood risk reduction infrastructure in the area, Basin 1 plays a crucial role in protecting York County from the impacts of flooding. Climate change and increasing water resource challenges underscore the significance of maintaining and managing such structures effectively to ensure their resilience in the face of evolving environmental conditions.