Denver’s Regional Transportation District says it will need about $2.4 billion more than expected to build all components of the city’s FasTracks rail expansion. The agency, which released its 2010 FasTracks budget in January, puts the total at $6.6 billion, well beyond the $4.2 billion it can collect from taxes in the near future. RTD oversees bus and rail transit for the six-county Denver metro area. In 2004, the agency spearheaded an election in which voters approved $3.95 billion in new taxes for FasTracks. The program aims to build 122 miles of new commuter-rail and light-rail lines, 18 miles of
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.