Photo Courtesy HNTB/Trey Cambern Crews used a computer-controlled heavy-strand jack system to pick the main span's 405-ft-long, 85-ft-tall, 45-ft-wide prefabricated steel arch into place. Photo Courtesy HNTB/Trey Cambern The new steel arch marks the impending opening of a New York-Vermont crossing that is crucial to communities in both states. Crews are working on the finishing touches on a vital link between New York and Vermont over Lake Champlain. While the originally planned October reopening day has passed, no rescheduled date has been announced.A routine inspection of the Crown Point Bridge in October 2009 found unexpectedly high levels of pier deterioration,
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.