The California High-Speed Rail Authority approved the first phase of the $43-billion, 800-mile statewide system, giving the go-ahead to a stretch between the small towns of Madera and Corcoran in the Central Valley. The 65-mile-long project will include two stations in downtown Fresno and one at a site east of Hanford, along with a maintenance center located between Merced and Bakersfield. This initial segment will use about $4 billion of the available $4.3 billion to also acquire rights of way, construct viaducts, prepare the site, restore vegetation, build rail bridges, realign roadways and relocate existing railways and utilities. The authority’s
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.