The Deep Watershed (HUC 03030003) covers an area of 1,542 square miles and is located in the western region of Montana. The watershed is characterized by high mountain peaks, steep valleys, and frequent snowfall. It is one of the primary sources of water for the Clark Fork River and the surrounding communities. The snowpack in the area is typically deep and persists into the late spring and early summer months, providing a steady source of runoff for the watershed. Surface water in the area is primarily derived from snowmelt and precipitation, and can be subject to high levels of sediment and other pollutants. The reservoirs in the watershed contain a variety of constituents, including fish, wildlife, and recreational opportunities. Interesting climatic facts and trends in the area include high levels of snowfall, frequent freeze-thaw cycles, and increasing temperatures due to global warming.