I've been taking pictures at various different bridge sites in the areas surrounding Sangamon county and I was in Tazewell county on 02 February 14 and took about 20 pictures of each bridge with a 16 MP camera. I noticed that this particular bridge was missing a lot of pieces of it's deck, as you can see in the photos.
The approach span is a Pratt as well.
Here is a link to the photos.
http://www.douglascoulter.com/BridgeSigns/tazewell_county_4....
I have never admitted to being a truss expert and never will, but the through truss is a pinned pratt, as for the pony truss, I'm not really sure since it only has two panels. Its pinned as well. The Bridge does still exist.
My husband and I found this bridge yesterday. There is no longer a true road going to it that we could find on the 1 side. There are spirits out there though that I caught on camera as the devils fog came upon us as I was shooting pictures.