Construction is set to begin this month on a 1,045-meter-long bridge over the Mackenzie River near Fort Providence in Canada’s Northwest Territories—a project that required a substantial redesign, adding $18 million to the total cost. The new superstructure design had to be integrated with the original approved substructure design. Photo: Rendering: Infinity Engineering A redesign of a new Canadian crossing reduced the amounts of concrete and steel needed. An independent design review team of San Francisco-based T.Y. Lin International and Edmonton, Alberta-based BP Tech Engineering found to be substandard the design by Calgary-based Spronken JR and Associates Ltd. The territories’
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.