The Kishwaukee Watershed (HUC 07090006) covers approximately 1,118 square miles in northern Illinois and southern Wisconsin. Its hydrology is characterized by several streams and rivers, including the Kishwaukee River, which flows through the center of the watershed. The watershed receives an average of 35 inches of precipitation annually, with snowfall being a significant contributor during the winter months. The watershed contains several reservoirs, including Pierce Lake, which serves as a source of drinking water for the city of Rockford, Illinois. The reservoirs are primarily used for flood control, recreation, and water supply. In recent years, the Kishwaukee Watershed has experienced significant flooding due to heavy rainfall events, which have become more frequent due to climate change. The watershed is also home to a diverse array of plant and animal species, including several threatened and endangered species.