To build Mexico’s 750-MW La Yesca hydroelectric project, the construction consortium first had to divert the Santiago River through a pair of 14-meter-square tunnels, one 830 m long and the other and 870 m. The $767-million concrete-faced rock-fill dam, with a 220-m-high crest and a length of 628 m, is on schedule for completion in 2012, according to Mexico’s largest contractor, Ingenieros Civiles Asociados, which is leading the project’s construction consortium. Work on the project—located 105 km northeast of Guadalajara, the capital of Jalisco State in western Mexico—began in 2007. The workforce peaked at 5,000 in April 2011. Ingetec S.A.,
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.