The Upper San Joaquin Watershed, located in the Sierra Nevada Mountains of California, covers approximately 2,159 square miles. The hydrology of the watershed is characterized by snowmelt-dominated streams and rivers, with the snowpack serving as a critical source of water for downstream communities and agricultural activities. The watershed is home to several major reservoirs, including the Don Pedro and New Melones Reservoirs, which provide both water storage and flood control. In recent years, the watershed has experienced significant changes in climate patterns, with warmer temperatures leading to reduced snowpack and earlier snowmelt. This has led to challenges for water management in the region, including reduced water availability for irrigation and increased risks of drought and wildfire. Despite these challenges, the Upper San Joaquin Watershed remains an important region for both ecological and human communities, providing critical habitat for a variety of plant and animal species and supporting a thriving agricultural sector.