The American Society of Civil Engineers released its comprehensive 2009 Report Card for America’s Infrastructure on March 25. ASCE released a preliminary report of the national letter-grade findings on Jan. 28, assigning the nation’s roads, bridges, water systems and other critical infrastructure a cumulative grade of D and noting a five-year investment need of $2.2 trillion. The version now out breaks down the data in state-by-state detail. See www.asce.org/reportcard.
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.