MSNBC.com does a real public service by publishing this State-by-state list of deficient or obsolete bridges. A deficient bridge is what it sounds like; obsolete means that while the bridge doesn't have major maintenance issues, the design isn't sufficient for modern traffic volumes.
Not surprisingly, the North-east, with the oldest infrastructure and a vicious freeze-thaw-heat cycle does worst overall, although the Midwest isn't doing great. Florida, being a fast-growth Sunbelt state has more troubles with “obsolete” bridges (is every bridge in Miami on that list?) than deficient ones.
Next, the Google Maps markup…
I’m not surprised to see Pennsylvania in red. I have family in northeastern PA and bridges fall down or get washed away there a lot. When I lived in Philadelphia a pedestrian bridge got knocked down, and an entire elevated highway got melted by a tire fire. You can read what truckers say about PA roads here:
http://www.etrucker.com/apps/news/article.asp?id=50570
Every time I drive there I double check that my AAA membership is current.