As the American Recovery and Reinvestment Act moves past the 18-month point, some of its key construction programs have nearly all their funds awarded or under contract. As sectors—for example, highways and wastewater treatment—dry up as sources of future ARRA work, a few other programs, such as high-speed rail, are in their early implementation stages and still present prospects for design and construction firms in months to come. The House Transportation and Infrastructure Committee’s latest monthly ARRA update, released on Aug. 26, shows that of the $38 billion ARRA allocated for highway, transit and wastewater-treatment programs under the committee’s jurisdiction,
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.