PHOTO COURTESY OF Indiana Dept. of Transportation Discovery of a long-term crack in an Ohio River crossing prompted a federal advisory to inspect similar bridges using a certain type of steel that was common decades ago. The Federal Highway Administration is advising state transportation departments that oversee fracture-critical bridges constructed of T1 steel to inspect butt welds, just in case they have cracks similar to those recently discovered on the Interstate 64 Sherman Minton Bridge between Kentucky and Indiana. On Sept. 9, the Indiana Dept. of Transportation closed the 49-year-old bridge—a double-deck structure spanning the Ohio River with two 800-ft
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.