Isn't that usually the situation? The driver catches the blame. A few things to ponder. Was the minimum route clearance based upon center lane clearance, or shoulder clearance? The clearance is supposed to be based upon the lowest clearance on the roadway. Pennsylvania used to have low clearance signs everywhere, because the shoulder clearances were less than 13'6". Quite an eye-opener at 3am when your eyes are starting to droop and you see a 12'8" low clearance warning sign. The signs in New York were worse. I don't know how they measured them, but actual clearance was usually about 2 ft. higher than posted clearance.
Don't know what the load height was or the bridge clearance, but anytime the load height comes fairly close to the posted clearance, good idea to slow down, just in case.
Too many bridges and roads in the US are in really poor shape. The interstates are falling apart. In the past year I've seen at least 20 accidents that were caused by bad roads.