Construction of a 700-ft-long footbridge—cantilevered out on 20 steel beams and clinging to the side of a canyon in North Vancouver, British Columbia—has been an adrenaline-pumping building project that, when finished, will leave tourists breathless. Visitors to the Capilano Suspension Bridge & Park will be able to view the surrounding Canadian rainforest from a galvanized steel walkway with a 20-in.-wide timber deck, which is suspended 300 ft above the canyon floor and attached to a granite cliff face up to 20 ft away. It was difficult to even find a starting point for the design of the unique cliff-hanging attraction,
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.