The Fox River watershed covers 2658 square miles around the Fox River extending from Colgate, WI, to Ottawa, IL. The river runs 223 miles, and its flow is affected by 16 dams. More than 1.5 million people reside within the watershed. These maps show the watershed region and the river with its tributaries. Click each map for a larger view, or download the PDFs linked below for full-size printable versions.