Airport construction grants and other Federal Aviation Administration programs will keep running through March, thanks to a newly approved three-month extension. Final congressional action came on Dec. 10, with Senate passage. The bill is the latest in a series of extensions since September 2007, when the last multiyear FAA bill lapsed. The House did pass a three-year measure in May. In the Senate, a two-year bill cleared committee in July but is stalled.
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.