Thanks to james how climbed down to grab some photos of the underneath this bridge. he took them with my camera, but I have posted the photos. I believe the bridge is just a girder but some of the girder had some lacing on them.
It is only a lattice girder bridge if the lattice railings are tied into transverse floorbeams like this bridge in Michigan: http://www.historicbridges.org/michigan/veteranshome/index.h... If there are only longitudinal stringers, it is a beam bridge with lattice railings. http://www.historicbridges.org/michigan/riskey/index.htm
If it is truly a lattice girder, it is a rare and noteworthy structure. Ohio has/had an odd variation of some lattice girders that also feature extra structural members embedded in the lattice: http://www.bridgehunter.com/oh/wood/milton-road/
This example however looks like a steel stringer with lattice railings. Still a nice, worthy structure of any historic bridge collection! Bridges of this type are becoming rare because they are either small and cheap to replace, or agencies don't like the railings which are not AASHTO crash tested :)
Nice find J.P.
Not sure if you can call this a truss bridge. It looks like an Indiana Bridge Company type known as a "Lattice Girder"
This bridge is sitting on the North side of the Jackson County Fair Grounds. Right off the side of highway 250.
So while looking around on Shaard, I believe I may have found a relative of this bridge that was built by the Indianapolis Bridge and Iron Works. Here is a link, not sure if it will work. The bridge in the link is gone via streetview.
https://secure.in.gov/apps/dnr/shaard/r/3dade/N/60042d.jpg