The number of American Recovery and Reinvestment Act highway and transit projects out to bid, under contract and under way, as well as their dollar value, is climbing, but actual outlays still are low. As of June 30, 5,079 ARRA road and transit projects, worth $16.7 billion, were out to bid, the House Transportation and Infrastructure Committee said on July 27. Project total rose 24% from the May 31 level. ARRA highway outlays were $414 million as of July 21, the Transportation Dept. reported. Of projects out to bid, 3,553 contracts were signed, totaling $10.6 billion on June 30, up
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.