The Cincinnati Southern Bridge, officially the Cincinnati Southern Railroad Swinging Truss Bridge, is a RailroadTrussSwing Bridge that carries the Norfolk Southern Railway over the Ohio River between Cincinnati, Ohio, and Ludlow, Kentucky. The bridge is composed of 4 truss spans: A main span on the northern side of the bridge, a currently unused swing span on the southern side, and 2 additional spans over the main shipping channels in the center of the bridge. The bridge crosses the Ohio River just downstream from Cincinnati Proper, and can be seen clearly from the lower level of the nearby Brent Spence Bridge.
The Cincinnati Southern Railway Bridge was begun in 1875; it was completed in December, 1877, and immediately opened to traffic. Its cost exclusive of right of way was $811,683. The 519-foot (158 m) truss bridge was the longest bridge of its type when it was completed.
It was extensively modernized in 1922, and it remains the busiest railroad bridge in the city of Cincinnati today. Sadly, as of 1976, the bridge's swing span has been abandoned in its closed position, forcing all ships to pass under the 2 center truss spans. For extensively tall ships, the bridge marks the end of their Ohio River voyage.