Barnard Construction Co. , Bozeman, Mont., won a $26.9-million contract from the National Park Service to remove the Elwha and Glines Canyon dams on the Elwha River in Washington State’s Olympic National Park. The firm’s bid was $13 million less than the engineer’s estimate. Site construction is set to start in September, with actual dismantling a year later. “With award of this contract, we begin the countdown to the largest dam removal and one of the largest restoration projects in U.S. history,” says Karen Gustin, park superintendent. The contract includes removal of the 108-ft-high Elwha Dam, completed in 1913, 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.