The Upper Salt Watershed (HUC 15060103) covers an area of approximately 1,067 square miles in central Arizona. The hydrology of the area is dominated by the Salt River, with the Verde River being a significant tributary. The watershed receives an average of 18 inches of precipitation annually, with a significant portion falling as snow in the higher elevations. The snowpack in the watershed plays a crucial role in determining the availability of surface water for agricultural, municipal, and recreational uses during the dry summer months. The surface waters of the watershed are primarily used for irrigation and municipal water supply, with several reservoirs constructed on the Salt River to regulate flows. Interesting climatic trends in the watershed include increasing temperatures, decreasing snowpack, and increasing frequency and intensity of drought conditions.