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In 1923, the O'Shaughnessy Dam was completed on the Tuolumne River, flooding the entire valley under the Hetch Hetchy Reservoir. [2] The dam and reservoir are the centerpiece of the Hetch Hetchy Project, which in 1934 began to deliver water 167 miles (269 km) west to San Francisco and its client municipalities in the greater San Francisco Bay Area.
In late 1908, the citizens of San Francisco approved the allocation of $600,000 in bonds to be used to purchase land and water rights in the Hetch Hetchy Valley to build a dam for a reservoir and aqueduct lines. They also approved a $45 million bond in 1910 to be issued for the construction of all the water infrastructure. [6]
1907 - City of San Francisco votes to construct a water and power supply known as Hetch Hetchy that is located Yosemite [29] 1911 - Constitutional Act - California Railroad Commission takes over regulatory role of cities for electric rates [30] 1913 - Water Commission Act attempts to sort out the state's water rights
After water leaves Hetch Hetchy, it passes through tunnels towards powerhouses. Three pipes then bring the water across the Central Valley. Concerns about the Hetch Hetchy Aqueduct's ability to withstand earthquakes led to a $1.7 billion bond, approved by voters in November 2002. [64]
Moccasin generates 427 million KWh per year, and is fed by Hetch Hetchy water through the Mountain Tunnel, [5] which provides a maximum head of 1,300 feet (400 m). [4] Water diverted at O'Shaughnessy Dam feeds into the Hetch Hetchy Aqueduct, which provides 85 percent of the municipal water for 2.4 million people in the San Francisco Bay Area. [50]
Map of California's interconnected water system, including all eleven reservoirs over 1,000,000 acre-feet (1.2 km 3) as well as selected smaller ones.. This is a list of the largest reservoirs, or man-made lakes, in the U.S. state of California.
San Francisco diverts part of the Tuolumne far upstream for use in its Hetch Hetchy Water & Power System. No rationing is planned for the two dozen Bay Area locales that contract for this supply.
The SFPUC provides fresh water from Hetch Hetchy Reservoir and other sources to 2.7 million customers for residential, commercial, and industrial uses. About one-third of its delivered water is sent to customers within San Francisco, while the remaining two-thirds are sent to customers in Alameda, San Mateo, and Santa Clara counties.