Colorado's U.S. 6 Closed for Bridge Demolitions.The Colorado Dept. of Transportation closed Denver's U.S. 6 freeway on the weekend of Feb. 14 to demolish the Knox Court Bridge and part of the Federal Boulevard Bridge over U.S. 6. During the full closure, crews from contractor Edward Kraemer & Sons Inc., Castle Rock, Colo., completed 20 nights' worth of work in 72 hours. Tasks also included a lane shift to allow for additional bridge work, says Kevin Sullivan, CDOT project director. The $98-million project will replace six obsolete bridges on U.S. 6 between Knox Court and Interstate 25 and improve traffic
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.