Above, the I 35 bridge which went SLAM for no externally caused reason. No earthquake, hurricane, or tornado.
It simply was not maintained and prevented from rusting away because politicians had to get rich and pay back campaign contributors for getting elected in other contract ways. It's known as "deferred maintenance"
They screwed the ordinary people that commute to work every day in cars over that bridge instead of being responsible to their oath of office. 13 dead, 145 injured.
And this was the Cyrus Street Viaduct, Oakland Ca. 42 people killed when it succumbed to an earthquake, it hadn't been retrofitted to handle, plus, it was built on landfill.