Related Links: State Dept.'s page on Keystone XL project TransCanada Statement on Delay Construction industry and union groups are blasting the Obama administration for again postponing a decision on the proposed $5.3-billion Keystone XL oil pipeline.The State Dept. announced on April 18 that it would delay a decision on whether to approve building the controversial 1,179-mile-long portion of the pipeline from Hardisty, Alberta, to Steele City, Neb., in part because of uncertainty over a court case making its way through Nebraska courts over the pipeline’s route.Department officials did not say when a decision would be issued.In February, a Nebraska judge
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.