“…but by the 1980s, cracks were forming in the bridge’s supports, leading inspectors to rate the bridge a 2 on a 100-point federal safety scale and to eventually ban heavy trucks, buses, and fire engines. So county engineers decided it was time for a new bridge, and the least expensive option ($306 million) was to move the existing structure over to serve as a detour while a new one was built in its place. But the bridge’s rare design — a one-piece, 1,100-foot, 3,400-ton truss — posed an unusual problem. How do you move a whole bridge at once?” w/ photos + videos
