When John Hillman’s cell phone rings, out comes the tune of “Tom Sawyer,” released by the rock band Rush in 1981. The song is not just a favorite of Hillman’s—it comes as close to summing up his philosophy and personality as any one song could. A tribute to a “modern-day warrior,” it has inspired him to shrug off petty politics, win over skeptics and rebound from setbacks—all for the sake of an “obsession” that sets out to transform the infrastructure world for the better. Creating change took about 14 years for Hillman and his patented creation, a structural beam consisting
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.