The Portneuf Watershed, located in southeastern Idaho, encompasses an area of approximately 1,010 square miles. It is fed by a complex network of streams and rivers, including the Portneuf River, which originates in the Caribou-Targhee National Forest. The watershed is characterized by a unique hydrology, with a high snowpack in the winter and a dry, arid climate in the summer months. The snowpack plays a critical role in the watershed's surface water supply, providing water for irrigation, recreation, and domestic use. The Portneuf Watershed is also home to several reservoirs, including the American Falls Reservoir, which serves as a critical source of irrigation water for farmers in the surrounding area. In recent years, the watershed has experienced warmer temperatures and earlier snowmelt, which has led to concerns about declining water availability in the future.