Very upsetting story.
We can probably all think of bridges we use that we are now wondering about. Here in Cincinnati, it's the Brent Spence, the I-75-71 double-decker over the Ohio River, linking Ohio to Kentucky. It was built in 1963, and carries 150,000 vehicles a day -- twice its original intent -- and has been rated "structurally deficient."
Let's keep our brothers and sisters in Minnesota in our thoughts and prayers. Hope all is OK with your wife, pm01.
Mark
PS It all reminds me of the Silver Bridge collapse in 1967 -- a bridge linking West Virginia and Ohio that gave way because of corrosion and bad design -- that killed dozens of people.
For more info on major US bridge failures:
http://www.startribune.com/10204/story/1338956.html