DTI - Raisin River Bridge
Photo taken by SD Nowakowski
License: Creative Commons Attribution-Share-Alike (CC BY-SA)
View this photo at sdnowakowski.slickpic.com
BH Photo #462003
Clark is correct, this clearly is NOT a concrete arch bridge.
The tops of columns are sometimes flared to reduce the stress concentration at the corner. This looks like a slab resting on flared columns.
Iíve never seen one like this. It doesnít look like a true arch, but what is it? A slab with decorative piers?