Amid intense media attention, a design-build team on July 16 closed one of the most congested highway stretches in the country, demolished half an iconic bridge and reopened the 10-mile stretch to traffic 17 hours ahead of schedule—and earned a $300,000 bonus. Photo courtesy of L.A. Metro MIGHTY MULHOLLAND PARTIALLY FALLS Crews chipped away at the southern half of a historic bridge as part of a $1-billion freeway widening. The $1-billion Sepulveda Pass widening will add high-occupancy vehicle lanes to a stretch of Interstate 405 in Los Angeles. The last of three bridges to be demolished and rebuilt, the Mulholland
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.