Lake Superior lost 16 TRILLION gallons of water in the last ten years. Water from the lake empties through a lock and passes under the Minneapolis bridge, but the point is that it would be reasonable to think that bridge repairs would have been under way for a while now with the Army Corps of engineers available for consultation on site. Considering that another bridge is close by, why wasn't the bridge shut down completely before the collapse and traffic simply rerouted? Maybe it was for the sensational impact of having all bridges restructured/modified.
Does a bridge simply give way all at once or does it give any signals days earlier such as structural noises?