The I-30 bridge is literally the most recent—it would have been completed in the mid-50s, and opened in 1957-8....
And yet it’s still getting holes. It’s also handling far more traffic than it was ever intended to.
http://m.landlinemag.com/Story.aspx?StoryID=15539#.VW_YskVVg2s
Fortunately, there is another bridge under construction next to it as a replacement.
Also, you forgot that Calatrava monstrosity they finished last year, that’s the newest bridge until the I-30 one is finished.