US Bridge 'Design Issue' Detected

From what I've seen in the media, it appears corrosion is the primary cause of the Minneapolis's bridge structural failure. Blaming the contractors for overloading the bridge is red herring. Any first year student knows bridges are designed to safely accept loads well above their rating (sometimes as much a twenty times the rating).

The photographs of the rust swollen pins and broken links (which allow roadway expansion/contraction) are indicative of the cumulative effects of years of corrosion.

Salting winter bridge roads establishes ideal conditions for corrosion of underlying steel structures, especially jointed movable structures which have no protective lubrication or sealed bearing surfaces.

The local highway maintenance officials are responsible for assuring safe bridge maintenance practices. Corrosion in any amount indicates a lack of management oversight.

All this should have been easily seen by the inspectors, I'd love to see the report...