Columbia was a two lane clusterfuck when it was originally built and they quickly realized it needed to be 4 lanes but tried to save money converting it. Decades later it's pulling and falling apart and has been for several years. They literally need to lift the bridge deck and rebuild it. If you're Catholic, cross yourself everytime you go over it until they shut it down. It's a mini I-35 in waiting - the inconvenience of having it shut down for 3 months will be worth it. A pain in the ass but worth it.
PS - Hard to believe the Mensa Roundtable at Jusys couldn't figure it out. I live to serve.