The Upper Tombigbee Watershed covers an area of approximately 5,000 square miles and is located in northeastern Mississippi and northwestern Alabama. The hydrology of the area is characterized by a network of small streams and rivers that eventually flow into the Tombigbee River. The watershed receives an average of 56 inches of rainfall annually, with the heaviest amounts falling in the winter and spring months. Snowfall is infrequent but can occur in the higher elevations of the watershed. The surface water in the watershed is used for drinking, irrigation, and recreation, and it supports a diverse range of aquatic species. The watershed also contains several reservoirs, including the Aberdeen and Columbus lakes. Interesting climatic facts and trends include an increase in average temperatures over the past several decades and an increase in the frequency and severity of extreme weather events, such as droughts and floods.