To add, it doesn't matter if the agencies do the most thorough review in the world. They have no liability if there is something wrong with the design. The responsibility rests completely on the shoulders of the engineer that signed and sealed the plans and calcs.
My guess, and that's all anyone can do at this point, is that this bridge collapse isn't a problem with the design per se, but either a problem with the engineer not clearly giving instruction for installation and/or the contractor not following those instructions.