The Lower Yellowstone Sunday Watershed (HUC 10100001) is a large watershed located in Montana and Wyoming. It covers an area of approximately 6,146 square miles and is home to a diverse range of hydrological features. The watershed is characterized by seasonal snowpack, which provides water for surface water flow and reservoir constituents. The snowpack in the watershed is influenced by the region's climate, which is characterized by cold winters and hot summers. The surface water in the watershed is primarily sourced from the Yellowstone River and its tributaries. Interesting climatic facts about the watershed include its location in a region prone to frequent wildfires, which can have a significant impact on the hydrology of the watershed. Additionally, trends in the region show an increase in temperature and a decrease in snowpack in recent years, which may impact the availability of surface water and reservoir constituents in the future.