[Gogar]

When was the last bridge collapse of note 'before' this one?

If there's 600,000 bridges in the U.S.A., and one bridge collapses every (x) years, and (y) is the number of cars that pass over those bridges, (in the hundreds of millions each day, I bet), and the last bridge collapse was in 19xx,

C'mon, math majors. Help me out. But I can tell you I'll take those odds.

Unfortunate tradgedy? yes. Worry? not much. I bet you're as likely to win PowerBall.

Of course, we can only assume that more and more of our 20th century bridges will collapse in time as they get older and older.