It sure seams that bridges over the Mississippi river connected with Illinois are pretty high on the pucker power list, that really doesn't surprise me in the least. We have bridges here over small creeks that may have several 6" holes through the concrete bridge deck. Bridge maintenance in IL has not been a very high priority. They pretty much ignore them until the National Highway Administration gets after them to fix something. The old steal deck bridges at least let the water and salt fall through the deck surface.