Unable to finish some major bills before Sept. 30 deadlines, Congress is turning to stopgap measures to keep important federal construction programs running until lawmakers can strike deals on more permanent legislation or approve still further extensions. The programs include highway, transit and airports. Much of the construction industry’s focus is on highways and transit, whose authorization, the Safe, Accountable, Flexible, Efficient Transportation Equity Act: a Legacy for Users, is one of the bills lapsing on Sept. 30. The House passed a three-month extension on Sept. 23. In the Senate, Environment and Public Works Chairwoman Barbara Boxer (D-Calif.) and the
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.