The Stones Watershed (HUC 05130203) covers a land area of approximately 186 square miles in northwestern Montana. The hydrology of the watershed is primarily controlled by the Clark Fork River, which receives water from numerous tributaries, including the Stones River. The watershed is characterized by a cold and snowy climate, with an average annual snowfall of over 100 inches. This snowpack provides a critical source of surface water for both the river and surrounding ecosystems. The watershed also contains several reservoirs, including the Thompson Falls Reservoir, which serves as a source of hydroelectric power and irrigation. Interesting climatic trends in the area include increasing temperatures and changing precipitation patterns, potentially impacting the snowpack and overall water availability in the region.