Good thought about the age. I scrolled through the concrete girder bridges on here, and relatively few are pre 1920. I will have to keep an eye out for more of these. I am sure that there will be more of them to discover.
Robert... nothing to be ashamed of, I always visit the rarer bridges first, then as time/money etc allow start to go after the less significant stuff. And next to metal trusses and marsh arches, these really aren't all that significant. However, its worth noting that these pre-1920 examples are fairly old examples, at least compared to the Illinois and Michigan inventories for which I have more familiarity.
Hi Nathan:
Thanks for the tip. I have to admit that when I was living in Kansas, I really did not pay much attention to these bridges. I have started photographing them on trips back home.
Like this old bird - easy access from Muscotah - believe it's over Negro Creek. Still looks solid.