BikerBoy from Edwardsville, IL on 8/17/2012 8:24:57 PM:
Because of the vandalism and liability, you will not find parking at the bridge except for sponsored events. Agree that the visitor's center (on Dunn Road, across from MotoMart) is the best place. You don't want to miss the Chain of Rocks Bridge or the McKinley Bridge. The loop down IL and back up MO is 20 miles. Lots of different scenery, including the river, barges and gritty industrial areas.