The Dept. of Transportation has awarded $1.5 billion in American Recovery and Reinvestment Act grants to 51 projects that are expected to have a significant regional or national impact. The Transportation Investment Generating Economic Recovery (TIGER) grant winners cross most transportation modes, from bicycle paths to major bridges and freight-rail projects. Related Links: View summaries of each winning project DOT's awards, announced Feb. 17, range from $3.2 million for a Burlington, Vt., waterfront project, to $105 million for the "Crescent Corridor" freight rail-improvement program in Tennessee and Alabama. Interest in the TIGER program far outstripped the dollars DOT had available.
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.