The Lower Yellowstone watershed (HUC 10100004) covers a land area of 41,000 square kilometers in Montana and North Dakota. The hydrology of the region is dominated by the Yellowstone River, which flows through the watershed and into the Missouri River. The region receives significant snowfall in the winter months, with the snowpack reaching a peak in March. Surface water in the watershed is used for irrigation, municipal, and industrial purposes. The Yellowstone River also supports a variety of fish species, including the endangered pallid sturgeon. The region has several reservoirs, including the Yellowstone Lake and the Lake Sakakawea. The climatic trends in the area include an increase in temperature and a decrease in precipitation, which has led to drought conditions in recent years. Additionally, the region experiences frequent weather events, such as severe thunderstorms and tornadoes.