The U.S. Dept. of Transportation awarded $1.5 billion in grants through the American Recovery and Reinvestment Act to 51 projects in 41 states and the District of Columbia on Feb. 17, underscoring the Obama administration’s transportation priorities. The Transportation Investment Generating Economic Recovery funds, known as TIGER grants, target projects that USDOT identified as being “major national and regional transportation projects that are in many cases difficult to pursue through other government funding programs.” Although a mix of transportation modes received grants that range from $3.15 million to $105 million, freight-rail and transit projects received the largest individual grants. Unlike
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.