Iron bridge (Single Chain, 2,368', 1949, rebuilt 1999) across Chain of Rocks Canal W. of Mitchell, Chouteau Township, Madison County, IL. Old Alton Rd. S. 0.2 miles from jct with I270 exit 4 just W. of Mitchell, W. on Chain of Rocks Rd. 2.3 miles to the bridge. (3-6-06, N38 45.71 W90 08.28) Photo by Jack Schmidt.