Related Links: Text of the bill State Dept.'s Dec. 12 statement on Keystone XL pipeline Resolving a heated dispute, the House and Senate have cleared a bill to extend, through February, the current payroll tax cut for individuals and require the Obama administration to decide soon whether to let the controversial Keystone XL crude-oil pipeline move ahead.The stopgap measure, which the chambers approved in brief morning sessions on Dec. 23, was signed the same day by President Obama. Other provisions extend, through February, unemployment insurance benefits and prevent a cut in Medicare payments to doctors. Brian Turmail, a spokesman for the Associated
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.