The Upper Little watershed (HUC 11140107) spans an area of around 140 square miles and is located in southeastern Montana. The hydrology of the watershed is primarily influenced by the Yellowstone River, which serves as the main water source. The watershed receives an average annual precipitation of 16 inches, with the majority of the snowfall occurring between November and February. The snowpack in the area is generally light and melts quickly due to the warmer temperatures in the region. Surface water in the watershed is largely dominated by the Yellowstone River, which is important for both irrigation and recreation. The reservoirs in the area include the Lake Elmo Reservoir and the Yellowstone River Dam. The climate in the watershed is characterized by hot summers and cold winters, with an average annual temperature of 46°F. In recent years, the region has experienced an increase in average temperatures, which has led to changes in hydrology and snowpack. These changes have impacted the amount of water available for irrigation and other uses in the area.