Construction's jobless rate improved in April, declining to 17.8% from 20% in March, the U.S. Bureau of Labor Statistics reported on May 6. Last month's figure also was markedly better than the April 2010 level of 21.8%, but it remains the worst among major U.S. industries. BLS says construction gained 5,000 jobs in April, according to preliminary numbers. However, BLS says total industry employment “has shown little net movement since early 2010, after having fallen sharply during the prior three years.” By sector, jobs in heavy and civil construction rose by 12,700 in April, more than offsetting losses in buildings
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.