This early engineering marvel carried waters of the Illinois & Michigan Canal over the Fox River. The Fox River Aqueduct is the largest aqueduct along the I&M Canal Corridor. Built in the 1840s by David Sanger & Sons Construction Co. of Ottawa, the aqueduct spans a length of 464 feet. Supported by seven towering piers constructed of Joliet limestone, the aqueduct was once considered the eighth wonder of the world.