Lake John D Long, located in Union, South Carolina, is a state-owned reservoir primarily used for recreation. Completed in 1978, this earth dam stands at a height of 49 feet and has a storage capacity of 2,109 acre-feet. With a surface area of 81 acres, the dam is situated on Hughes Creek and is regulated by the South Carolina Department of Health and Environmental Control.

Despite being classified as having a high hazard potential, Lake John D Long is assessed to be in fair condition as of June 2020. The dam is inspected every two years to ensure its structural integrity and safety. While no spillway type is specified, the lake serves as a crucial recreational resource for the local community, offering opportunities for fishing, boating, and other water-based activities.

As a water resource and climate enthusiast, Lake John D Long presents an intriguing case study in dam management and maintenance. With its picturesque location and important role in providing recreational opportunities, this reservoir serves as a vital asset for Union, South Carolina, while also highlighting the ongoing efforts to ensure the safety and sustainability of our water infrastructure in the face of environmental challenges.