The intersection of Main and Harding in the north part of Clinton, formerly the town of Fulton, is where the Lyons-Fulton bridge reached Iowa after crossing the Mississippi River (and following a long dogleg). This is a few blocks north of where IA 136 crosses the river now.
This picture was taken before official Lincoln Highway signage was put up, but there’s a loop that comes through here before returning to 136 to enable the route to continue into Illinois.