Congress’s fast action on the $787.2-billion American Recovery and Reinvestment Act (ARRA) in February brought some much-needed cheer to the nation’s transportation contractors. With state DOT budgets withered by the recession, gas prices and financial market upheaval, contractors expected the influx of more than $49.3 billion in immediate highway, transit, and airport funding to reenergize the market and, hopefully, keep them busy until the larger economy begins to rebound. But more than six months after President Obama signed ARRA into law, many in the industry are still waiting for those hoped-for effects to kick in. Photo: Flatiron Washington, N.C., bypass
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.