(Martin Sprague Memorial, 30' x 12', 3' overhang, 1973, 13-20-A) across a ravine in a park at the N. edge of Clinton, De Witt County, IL. From Southbound US51 N. of Clinton, take Business US51 S. 1.6 miles to the bridge on the E. side of the road. (10-8-00, N40° 09.65', W88° 57.59')