The Red Rock Watershed (HUC 10020001) is located in central Arizona and encompasses 784 square miles of land. The hydrology of the watershed is driven by the Verde River, which flows through the area and is fed by several small tributaries. The watershed receives an average of 20 inches of precipitation per year, with most of it falling during the winter months. Snowpack in the area is generally light, with only a few inches accumulating in the higher elevations. Surface water in the watershed is dominated by the Verde River and several small reservoirs, which are used for irrigation and recreation. The reservoirs contain high levels of sediment and nutrients, which can lead to algal blooms and other water quality issues. Interesting climatic facts include the frequent occurrence of monsoonal thunderstorms during the summer months and an increase in average temperatures over the past few decades.