yep.. fracture critical bridge and evidence of prior vehicle strikes has been found in preliminary inspection. Detailed failure analysis reports, when available, should be interesting read.

built on the cheap years back to finish out the interstate system.. lots more of them around...

re: fracture critical bridges....
Quote

Fracture critical bridges, like the I-5 span in Washington, are the result of Congress trying to cut corners to save money rather than a lack of engineering know-how, said Barry B. LePatner, an author of "Too Big to Fall: America's Failing Infrastructure and the Way Forward."

About 18,000 fracture critical bridges were built from the mid-1950s through the late 1970s in an effort to complete the nation's interstate highway system, LePatner said. The fracture critical bridge designs were cheaper than bridges designed with redundancy, he said


http://www.4nsi.com/assets/files/Bill-Nelson-Bridge-Inspection.pdf

http://www.usatoday.com/story/news/nation/2013/05/26/washington-bridge-collapse-ntsb/2361505/