This is a curious abandoned Railroad bridge. The right-of-way of this rail line is abandoned from Danville west. This bridge crosses Rock Creek right next to Hwy 10, just west of Waveland. The railroad, which still operates East of Danville is called the Little Rock & Western, but I am unsure if this is the original owner. It might possibly originally be Rock Island.
The curious aspect of this is it has characteristics of a pony plate girder bridge, but there are no plates, making it look like some kind of truss bridge, however there are no diagonal members characteristic of truss bridges. It is possible that the "plates" were salvaged out at some time, but they would have to have been torched out.
Any additional information would be appreciated.