Despite recent heavy opposition, including a court-ordered temporary restraining order, California’s Dept. of Transportation and the San Francisco County Transportation Authority have awarded a public-private partnership contract to their selected bidder for the second phase of the $1-billion Doyle Drive replacement project, known as Presidio Parkway, in San Francisco. Photo: Courtesy Caltrans As work nears completion on the first half of a new $1-billion parkway, court allows concessionaire contract to move forward. Photo: Courtesy Caltrans Caltrans announced the agreement on Jan. 3, just hours after an Alameda County Superior Court judge dissolved the restraining order the court granted on Dec.
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.