The Stillwater watershed (HUC 10070005) covers an area of 2,751 square miles in Montana and Wyoming. It is primarily a high-elevation mountainous region with snow-dominated hydrology, meaning that much of the surface water comes from snowpack. The watershed contains several large reservoirs, including the Stillwater and East Rosebud reservoirs, which provide water for irrigation and municipal use. The water in the reservoirs is primarily used for agricultural purposes, including cattle and sheep grazing. Interesting climatic facts include the frequent occurrence of intense summer thunderstorms, which can cause flash flooding and landslides, and the high levels of precipitation in the winter months. Additionally, recent trends show an increase in temperatures and a decrease in snowpack, leading to potential impacts on streamflow and water availability for the region.