Lower Sulphur

Watershed Hydrology

The Lower Sulphur Watershed (HUC 11140302) covers an area of approximately 536 square miles in western Montana. The watershed is characterized by high peaks and deep valleys, with elevations ranging from 3,000 to over 8,000 feet above sea level. The hydrology of the area is dominated by snowmelt runoff, which contributes to the surface water and reservoirs in the watershed. The snowpack in the area is highly variable and can range from less than 50% to over 150% of normal, depending on the year. The surface water in the watershed is generally clean and clear, with low levels of pollutants. The reservoirs in the watershed are primarily used for irrigation and recreation. Interesting climatic facts include the high variability in snowpack, high precipitation levels in the winter, and occasional extreme weather events such as heavy snowfall and flooding. Trends in the watershed include a decreasing snowpack, increasing temperatures, and potential impacts on water availability in the future.


Surface Flows

Lower Sulphur Watershed

Snowpack Depths

Lower Sulphur Watershed

Dams & Reservoirs

Lower Sulphur Watershed

Groundwater Levels

Lower Sulphur Watershed

Lower Sulphur Rivers

Rivers of the Watershed