The Saguache Watershed (HUC 13010004) spans across an area of 5,317 square miles in south-central Colorado. The headwaters of the Rio Grande River originate from the snowmelt and runoff in this watershed. The hydrology of the area is characterized by high-altitude, mountainous terrain that receives significant amounts of snowfall in the winter months. The snowpack in the watershed is critical for water supply during the dry summer months. Surface water is sourced from streams and rivers, and there are several reservoirs within the watershed that serve as storage for irrigation and municipal water supply. The climatic trends include warming temperatures, reduced snowpack, and changes in precipitation patterns. The constituents of the reservoirs in the watershed have shown increased levels of sediment and nutrient loading in recent years, which has led to concerns over water quality.