The U.S. General Services Administration on Aug. 14 let its largest stimulus-funded project so far, a $435.4-million design-build contract for the new U.S. Coast Guard headquarters building in Washington, D.C. Clark Construction Group of Bethesda, Md., led the winning team, joined by St. Louis-based HOK, which will provide interior designs, landscape architecture, construction documents and administration. The Washington office of WDG Architecture is architect-of-record. Chicago-based Perkins+Will created preliminary designs and bridging documents for the 1.2 million-sq-ft building, which will aim for a LEED Silver rating. The headquarters, along with a 1,000-car parking garage, will be built on the new 4.5
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.