The Upper Nueces Watershed (HUC 12110103) spans over 4,200 square miles in South Central Texas. The hydrology of the watershed is characterized by an arid to semi-arid climate, with an average annual precipitation of 20-30 inches. The watershed is also known for its unique karst topography, which leads to rapid infiltration of surface water into the ground. The watershed is a significant source of surface water for the region, including the Nueces River and several smaller tributaries. The main reservoirs in the watershed are Lake Corpus Christi and Choke Canyon Reservoir, which provide drinking water, recreational opportunities, and support agriculture in the region. Interesting climatic facts and trends include the frequent occurrence of droughts and wildfires, as well as the impact of Hurricane Harvey in 2017, which caused significant flooding in the watershed. The area also experiences occasional snowfall, with the most recent significant snowpack occurring in 2017. Overall, the Upper Nueces Watershed is an important and unique region within the state of Texas.