The push for a multiyear surface- transportation bill has suffered a setback on a Senate procedural vote on March 6. Backers of a two-year, $109-billion measure fell eight votes short of the 60 needed for cloture to cut off debate and move ahead on the bill.House Republicans at press time were determining how—or whether—to revise a five-year, $260-billion bill that had cleared committee. On March 1, Speaker John Boehner (R-Ohio) said there is GOP opposition to an 18-month bill. "Apparently, our members don't think too highly of it. I would only look at it as a fallback measure," he said.
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.