There is a huge problem right now with people talking out of the sides of their heads (or some other part of their anatomy) who don't have a clue what they're their talking about.

On Fox News, they have a list of "Worst Recent U.S. Bridge Disasters". Of the listed bridge collapses, The Schoharie Creek Bridge in NY and the Hatchie River Bridge in TN both collapsed due to scour (undermining) during historic flooding, the Sunshine Skyway Bridge in FL (not W. Va as noted) and the I-40 bridge in eastern OK, were both struck by shipping traffic, the Silver Bridge in OH collapsed due to a structural failure and I don't know about the Zuber Creek Culvert, but experience with culverts would lead me to believe that it was eroded out during severe flooding.

To have only 2 structural collapses with major loss of live in 40 years, considering the number of bridges and amount of road travel we have here in the U.S., is actually quite remarkably low.