It’s one of thousands of homes that flooded twenty years ago in Hurricane Katrina. Flood waters from Hurricane Katrina cover streets in New Orleans on Aug. 30, 2005. Interstate-10 westbound out of New Orleans was jammed with traffic as residents evacuate ahead of Hurricane Katrina on Aug. 28, 2005. About what worked at Katrina.”Twenty years after Hurricane Katrina, New Orleans still hasn’t fully recovered. Hurricane Katrina caused some $125 billion in damages, making it the costliest hurricane in U.S. history.