This unique overpass carries a Union Pacific mainline across K-4.
It was built in 1924 as part of an improvement plan by the Rock Island. The bridge was likely originally constructed to cross the creek below.
The bridge also crosses Lime Creek. It is a rather large structure which is a fairly iconic overpass.
The bridge consists of a massive deck girder span, approached by concrete arch spans on either side. The entire bridge is set onto concrete substructures.
Overall, the bridge appears to be in good condition. It is one of the busiest bridges along this line, due to the location at the end of a rail yard.
Because of this, the author has ranked it as being locally significant. Despite it being a unique underpass, it is still a common design and more modern.
The photo above is an overview.