2006 – 2030: Today and beyond   – Hetch Hetchy system provides high-quality drinking water to 2.5 million Bay Area residents; 85% of water comes from High Sierra -Hetch Hetchy hydropower delivers about 1.7 [...]

1935-2005： Expanding and improving the Hetch Hetchy system   1930′s-1970′s- Additional San Joaquin and Bay Division pipelines completed 2002- Voters approve bond measure to rehabilitate water system 2006-2030: Today and beyond (click to see more) [...]

1914-1934: Building the Hetch Hetchy system   1919-1923- Hetch Hetchy Reservoir built 1921-1925- Moccasin Powerhouse, tunnel and penstocks built 1930- San Francisco purchases Spring Valley Water Co. for $40 million 1934- First Hetch Hetchy water [...]

1906 – 1913: Securing water rights in the high Sierra   1910- San Francisco voters pass $45 million bond measure to build water system 1912- Preliminary design for Hetch Hetchy system; Michael O’Shaughnessy hired as [...]