House Transportation and Infrastructure Committee Chairman James Oberstar (D-Minn.) says he plans to soon unveil a new, multiyear surface transportation bill and predicts that it will move to the House floor in early June. Oberstar declined to disclose the amount of funding that the measure would authorize. An April 24 American Association of State Highway and Transportation Officials-American Public Transportation Association report says highway capital spending by all government levels needs to reach $132 billion to $166 billion a year by 2015, depending on traffic growth. That compares with $78.7 billion spent in 2006. The report pegs annual transit capital
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.