America's Most Dangerous Bridges
Kim Karpeles / Alamy
No. 1 Storrow Drive WB over Storrow Drive EB (Storrow Drive Tunnel), Boston
This double-deck roadway abutting Back Bay has been a headache practically since it opened in 1951. The problem: the pavement of the upper deck is too thick, straining the corroding steel beams that support the structure from underneath. Numerous rounds of costly interim repairs (most recently in 2012–13) have kept the artery open, but they’re merely stopgaps to extend its life through 2018 while longer-term solutions are weighed.