The spring watershed (HUC 11070207) covers an area of approximately 305 square miles in Montana. The area is characterized by a semi-arid climate, and is dominated by grasslands, shrublands, and forested areas. The watershed is fed by snowmelt from the surrounding mountains, which contributes to the hydrology of the area. The snowpack in the watershed is typically moderate, with an average snow water equivalent of around 13 inches. Surface water in the watershed is primarily made up of small streams and tributaries, which eventually feed into the Yellowstone River. Reservoirs in the area are used for irrigation purposes and are characterized by high levels of sedimentation. Interesting climatic facts include the occasional occurrence of spring thunderstorms, as well as the frequent occurrence of cold air drainage, which can result in frost formation in low-lying areas. Current trends in the area include increasing temperatures and earlier snowmelt dates, which could have significant impacts on water availability in the future.