The Los Angeles County Metropolitan Transportation Authority (Metro) on April 23 voted to fund the first phase of the $1.03-billion Interstate 405 Sepulveda Pass Widening Project, adding a northbound 10-mile-long carpool lane, between I-10 and U.S. 101, to one of the region’s most congested freeways. The freeway connects the San Fernando Valley with the greater Los Angeles area. The project is a joint venture between Metro and Caltrans. Kiewet Pacific Co., Santa Fe Springs, Calif., was awarded a $712-million design-build contract. The project will be built in phases based upon funding availability. About $372 million already has been secured, including
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.