California Dept. of Transportation delayed opening of the San Francisco-Oakland Bay Bridge until federal inspectors sign off on the second bridge repair since Labor Day. The transportation corridor, which carries an estimated 280,000 cars per day, closed Tuesday evening after a steel bar cracked during a windy afternoon commute, dropping a 5,000-lb crossbeam and steel connectors into traffic. The incident caused a non-injury accident and an enormous traffic jam. Caltrans officials said they were doing all they could to open before the Monday morning commute, but were putting safety first. Photo: Caltrans Related Links: Update: Fix Of Bay Bridge May
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.