Hanging more than 200 ft over a jobsite in down- town Kansas City, Mo., James Hague doesn’t seem to notice the amount of air separating him from the people below. The senior technician fiddles with a dial gauge that measures the amount of play in the crane turntable, the giant gear that rotates the jib. “A bearing could go bad,” he says, suspended from a full-body harness. “And that’s something we want to know before the top falls off.” Slide Show Photo: Tudor Van Hampton / ENR Hague inspects bolts and pins on a J.E. Dunn tower crane working in
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.