From the San Francisco Chronicle:
The days are numbered for the old tower and decorative arches at Calaveras Dam, which holds back the reservoir that is San Francisco's largest local source of drinking water.
Workers for the San Francisco Public Utilities Commission will begin shoveling dirt today as part of a $416 million project to replace the 210-foot-high earthen barrier that has collected water from Alameda Creek for 86 years....
San Francisco Chronicle: Calaveras Dam replacement to begin amid retrofit