South Well Detention Dam, located in Graham, Arizona, along the San Simon River, was completed in 1981 by the Bureau of Land Management as a gravity-type structure for flood risk reduction. With a structural height of 24 feet and a hydraulic height of 19 feet, the dam has a storage capacity of 334.8 acre-feet, serving a drainage area of 1.73 square miles. Despite being classified as having a low hazard potential, the dam has not been rated for its condition assessment, with its last inspection dating back to July 2015.

Owned, funded, designed, constructed, regulated, inspected, and operated by the Bureau of Land Management, South Well Detention Dam plays a crucial role in managing flood risks in the region. With a primary purpose of flood risk reduction, the dam stands at 1,062 feet in length and covers a surface area of 16.72 acres. Although lacking a spillway type and outlet gates, the dam's maximum discharge capacity is 250 cubic feet per second, ensuring effective water management during peak flow events.

Ensuring the safety and functionality of South Well Detention Dam remains a priority, as its emergency action plan and risk assessment measures are currently not documented. With a focus on mitigating potential risks and enhancing operational efficiency, ongoing inspections and maintenance efforts are essential to safeguarding the surrounding communities and water resources supported by this vital infrastructure.