Oso Largo Dam, located in Fort Thomas, Arizona, along the Gila River, was completed in 1971 by the Bureau of Land Management with a primary purpose of flood risk reduction. This gravity dam stands at a structural height of 26 feet with a hydraulic height of 21 feet, offering a storage capacity of 616.7 acre-feet and serving a drainage area of 93.7 square miles. With a surface area of 241 acres, this dam plays a critical role in managing water resources in the region.

Despite its low hazard potential, Oso Largo Dam has been assessed as unsatisfactory in condition, warranting a closer inspection and potential maintenance to ensure its long-term functionality. The dam features an uncontrolled spillway with a width of 5 feet and has a moderate risk level assigned to it. While the dam has not been modified in recent years, regular inspections are carried out every five years to monitor its structural integrity and safety measures. With Oso Largo Dam being a key component for flood risk reduction in the area, its management and maintenance are essential for water resource and climate enthusiasts to monitor.