The Lower San Juan Four Corners watershed (HUC 14080201) covers an area of approximately 4,200 square miles in the southwestern United States, including portions of Arizona, Colorado, New Mexico, and Utah. The watershed is characterized by a semi-arid climate with significant variations in temperature and precipitation. Snowpack accumulation occurs in the higher elevations during the winter months and provides a vital source of surface water for the region. The San Juan River, the primary surface water source for the watershed, flows through numerous canyons and is subject to high sediment loads and flood events. The watershed contains several reservoirs, including Navajo Reservoir, which provides irrigation water for the region. Interesting climatic trends in the area include increasing temperatures and decreasing snowpack accumulation, which have resulted in changes to the hydrological cycle and water management practices in the watershed.