A rocky season in Colorado began on cue on March 8 with a rockslide on Interstate 70 near Glenwood Springs. It punched holes in a bridge and dumped boulders the size of semitrucks on the highway, closing a 17-mile stretch. Four days later, the Colorado Dept. of Transportation announced that Flatiron Construction Corp. of Longmont, Colo., was the apparent low bidder for the contract to repair damage. The job includes 400 linear ft of westbound barrier, 150 linear ft of eastbound steel bridge rail, a design-build fix of 460 sq ft of retaining wall, 500 tons of base course and
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.