Francis Scott Key Bridge collapse in Baltimore...

it seems like they replaced the twin spans over Lake Pontchartrain fairly quickly after Katrina...it was obviously different since they were able to piecemeal one of the bridges as a temporary bridge to allow traffic to continue....

still, it was 2 separate bridges at about 6 miles each that went up pretty quickly, from what i remember....

they put the temporary 2 lane span in place in a few weeks/months and then it took 3+ years to build the new ones