The Senate Environment and Public Works Committee has approved a bill that would extend the federal-aid highway program for 18 months, authorizing $61.5 billion over that period. The panel cleared the measure on July 15 by an 18-1 vote. Only Sen. George Voinovich (R-Ohio) voted against it. Photo: Senate Environment and Public Works Committee, Majority Boxer kept bill "clean" of policy-related provisions The extension would begin on Sept. 30, when the current multi-year surface transportation bill--the Safe, Accountable, Flexible, Efficient Transportation Equity Act: a Legacy for Users (SAFETEA-LU)--will lapse. It would keep authorizations at the fiscal 2009 levels, providing $41
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.