“Hey,,,How much SALT is used on that bridge in the winter ??...”
That would be a point if it were a deck failure, but I didn’t see anything that looked like a deck elongation happened.
~~~~~~~~~~~~~~
JMHO : This sounds more like rivet/iron failure the more info that comes out,,,
FYI : You could pull the whole deck off of that or any other bridge and the iron would still be standing,,,
Salt corrodes rivets...