170 foot long Warren Truss, a single leaf, Strauss-type, bascule bridge, the third C&NW Railway bridge to cross the Chicago River at this location.
The bridge originally carried freight and passenger traffic to the Wells Street Station. When the C&NW moved passenger service to their new passenger depot on the west shore of the river (today it is the Ogilvie Transporation Center) the bridge was used for freight only.
The lines went all the way to Navy Pier. Using air rights, the Merchadise Mart was built on the site of the Wells Street Station, over the tracks that served the Merchandise Mart and continued through the enormous building.
The last freight customer was the Chicago Sun-Times. The Union Pacfic absorbed the C&NW in 1995. The newspaper moved operations in 2001, leaving the UPRR with no customers east of the river, so the line was abandoned.
The bridge remains in place, in the raised position. Because of the historic nature of the structure and the importance of the Chicago-based C&NW in the transcontinental railroad, the Kinzie Street railroad bridge was declared a Chicago Landmark on December 12, 2007.