A day after receiving a Presidential Permit, contractors for Enbridge Energy Partners LP, Houston, began work on the U.S. portion of a 992-mile pipeline. The Alberta Clipper will move 450,000 bbl per day from Canada’s oil sands in Alberta to Superior, Wis., with a planned capacity of up to 800,000 bpd. Photo: Enbridge Energy Partners LP Work is beginning in U.S. portion. More than 3,000 U.S. workers will be employed on the 326 miles of 36-in. pipeline, five tanks, three pumping stations and a companion 188-mile-long, 20-in. pipeline to carry diluents to Canada, says Jim Crawford, director of engineering and
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.