An article I read in misc.transport.road reminded me of my old stomping grounds, in Memphis, Tennessee
Above are the first three bridges across the Mississippi River at Memphis. From top-to-bottom we have the Harahan Bridge (built in 1916), the Frisco Bridge (built in 1892), and the Memphis-Arkansas Bridge (built 1949). The first two bridges are single-track railroad bridges, while the last carries I-55, US 61, US 64, and US 70 across the river.
Prior to the completion of the Memphis-Arkansas bridge, automobiles could cross the river using two wooden roadways on the outside of the Harahan Bridge. The bridge planking was removed after the Memphis-Arkansas bridge opened, but the approach roads and other remnants can still be seen today.
For more information about the rail bridges, check out the Memphis Historic Railroading site, or Steve Cox’s travelogue exploring the traces of the Harahan roadways.