Recent bid openings for subway projects in New York City and San Francisco revealed a range of prices and teaming partners. In New York City, the Metropolitan Transportation Agency opened bids on June 7 for a contract to furnish and install systems and finishes on the No. 7 subway line extension. A joint venture of Skanska Civil and Railworks was the low bidder at $513.7 million, followed by the joint venture SPP, at $539.8 million; Tutor Perini, at $542.2 million; a team of Judlau and Citnalta, at $563 million; CCA, at $598.5 million; and CHRE Construction LLC, at $758.5 million,
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.