Related Links: Highway-Transit Stopgap Stuck in House Senate Passes $109B Highway-Transit Bill Beating a March 31 deadline with little time to spare, Congress has approved—and President Obama has signed—legislation that would keep federal highway and transit programs running for the next three months. The stopgap is the ninth short-term extension since September 2009, when the last multi-year authorization expired. Final congressional action on the bill came on March 29, when the Senate passed it on a voice vote. Earlier in the day, the House had cleared the measure by a 266-158 tally.Obama signed the bill on March 30, one day before
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.