ASCE Improving from a GPA of D to D+ seems like little to brag about, but against the vast scale of the nation's infrastructure, it is significant. Related Links: ASCE 2013 Report Card ASCE Report Card Shows Slight Improvement in Nation's Infrastructure Health Engineers are known for meticulous, methodical problem-solving, and this approach is paying off for the American Society of Civil Engineers. Launching its first report card on U.S. infrastructure in 1998, the society continues to issue new ratings in 16 infrastructure categories every four years, and it has been making significant improvements in the process. The newest report
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.