The Middle San Juan Watershed (HUC 14080105) covers an area of about 2,400 square miles in southwestern Colorado. The watershed is characterized by high elevations, with mountain ranges such as the San Juan Mountains and the La Plata Mountains dominating the landscape. The hydrology of the watershed is heavily influenced by snowpack, which is especially significant in the upper elevations. The watershed feeds several large reservoirs, including the Navajo Reservoir, which plays an important role in the region's water supply. The surface waters of the watershed are rich in nutrients, and support a variety of aquatic life, including trout and other fish species. Climatic trends in the watershed include increasing temperatures and decreasing snowpack, which could have significant impacts on water availability in the region. Additionally, the area experiences monsoonal moisture patterns, bringing a large amount of precipitation during the summer months.