Cell J, located in Sweetwater, Wyoming, is a private earth dam primarily used for tailings storage with a height of 10 feet and a storage capacity of 491 acre-feet. Despite being classified as having low hazard potential, the dam has not undergone a recent condition assessment, and its emergency action plan status is unknown. The Mine Safety and Health Administration regulates this structure, with inspections conducted by the same agency.

While Cell J does not fall under state jurisdiction or regulation, its location in Manila, Wyoming, just 60 miles away from the city of Rock Springs, raises concerns about potential environmental impacts in the event of a dam failure. The dam lacks spillway infrastructure and detailed information on outlet gates, posing challenges for effective water management. Further evaluation and monitoring of this structure are necessary to ensure its safety and compliance with industry standards in the face of changing climate conditions.