A starting place, by states:
http://www.statemaster.com/graph/trn_bri_str_def-transportation-bridges-structurally-deficient
You might try searching the Dept of Transportation website for more information.
Look at the ratings the inspections gave it - a 4 out of 0-9 for the sub-structure!
Too much money is going to trains here, not the infrastructure for the over-travelled highways here !!!