Photo Courtesy of San Francisco Public Utilities Commission Two ancient landslides were discovered during excavation for the new Calaveras Dam, requiring an additional 3.5 million cu yd of excavation and adding significantly to the project's budget. Related Links: Water Pipeline Designed to Surf Seismic Waves Seismic Upgrade of San Francisco's Water System a Race Against Time Huge Gates Take 600-mile Trek to California Dam Site With a budget of $718 million, the Calaveras Dam Replacement dwarfs other projects in SFPUC's Water System Improvement Program. Located in the Sunol Valley southeast of Fremont, the project replaces the original dam, built in
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.