A walkway for railroad workers was added in 1999.
This bridge was constructed by the Kansas City North Western Railroad. The first bridge at this location was destroyed in 1903 by a flood, and a replacement was contracted for in July of that year. [Source - I.E. Quastler, Missouri Pacific Northwest: A History of the Kansas City Northwestern Railroad, 1994]
The brige was used by the Missouri Pacific and the Chicago Great Western, and is still in use by the Union Pacific.