PHOTO COURTESY OF Trey Cambern 2011 / HNTB Corporation Steel arch is put in place on new Lake Champlain Bridge. Infrastructure 900-Ton Lift Tops Off Bridge Job A crucial New York-Vermont link is in the home stretch after the successful installation of a 405-ft-long, 85-ft-tall, 45-ft-wide tied steel-arch main span over Lake Champlain on Aug. 28. Under a $70-million fast-track contract, Flatiron Constructors lifted the 900-ton piece into place with a strand jack system supported by barges. Now more than 80% complete, the new crossing will replace an old bridge that was abruptly shut down in 2009 because of safety
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.