The Lower Gila Watershed (HUC 15070201) encompasses a land area of approximately 11,340 square miles in southwestern Arizona. The watershed is largely arid and semi-arid, with hot summers and mild winters. The hydrology of the region is dominated by the Gila River, which flows through the center of the watershed. The watershed receives minimal precipitation, with an average annual rainfall of around 6 inches. Snowfall is rare in the region. Surface water in the watershed is limited, and the Gila River is often dry during the summer months. Groundwater is an important source of water for the area. There are several reservoirs in the watershed, including the San Carlos Reservoir and the Coolidge Dam. The reservoirs provide water for irrigation, municipal use, and recreation. The Lower Gila Watershed is subject to periodic droughts, which can impact both surface water and groundwater resources. Climate change is expected to exacerbate drought conditions in the region, leading to increased water scarcity.