Barber Creek Bridge
Photo taken on February 11, 1916.
Photo taken by David Sebben
BH Photo #414881
Looks to me like it's a bowstring pony truss. It's the diagonals members that make it a truss, and I see those.
The details are hard to see, but it sure looks like it could be one built by King Iron Bridge & Mfg Co. From http://kingbridgeco.com/siapaper.html it seems he was pretty busy building bridges in the late 1800s. So if the photos were from 1916, the bowstring bridge could be 40 years old.
I do agree that it appears they are removing the bowstring after installing the concrete bridge. Notice the coursed stonework abutment. It sure looks older than the concrete.