Thanks in part to design-build and a lane rental arrangement, a bridge over Interstate 75 near Detroit reopened to traffic on Dec. 11, less than five months after collapsing in flames. Photo: Bergmann Associates Michigan transportation officials and their contractor team credit a lane rental agreement process and design-build for speeding the rebuilding of an Interstate overpass, competed in under five months. The steel beams of the two-span Nine Mile Bridge in Hazel Park, Mich., melted on July 15 after a car hit a tanker truck on six-lane I-75, causing 14,000 gallons of fuel to erupt in flames. “The northbound
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.