(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. (N38 45.711 W90 08.289) Photo by Jack Schmidt 3-6-06.