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By the 1880s, San Francisco was looking to Hetch Hetchy water as a fix for its outdated and unreliable water system. [41] The city would repeatedly try to acquire water rights to Hetch Hetchy, including in 1901, 1903 and 1905, but was continually rebuffed because of conflicts with irrigation districts that had senior water rights on the ...
The reservoir has a natural catchment area of 25.4 square miles (66 km 2); [2] however, most of its water is imported through the Hetch Hetchy Project pipelines. In order to protect the high-quality Hetch Hetchy water, local flows from Moccasin Creek are captured upstream and routed through a bypass system that discharges downstream of Moccasin ...
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]
Michael Maurice O'Shaughnessy (28 May 1864 – 12 October 1934) was an Irish civil engineer who became city engineer for the city of San Francisco during the early twentieth century and developed both the San Francisco Municipal Railway (Muni) and the Hetch Hetchy water system.
That October, with construction of the dam underway, San Francisco's City Engineer, Michael O'Shaughnessy, wrote negatively of Mulholland in a letter to John R. Freeman, an engineer who had assisted the city in its pursuit of permission to construct the Hetch Hetchy reservoir and water system in Yosemite National Park.
Homes are used for employees who work on the Hetch Hetchy Water & Power system. Most buildings are painted the same color and homes in the community look similar as a result. There are no stores or gas stations. Construction on the original Moccasin Powerhouse, designed by San Francisco architect Henry A. Minton, was started in Fall 1921. The ...
The uppermost dam is the O'Shaughnessy, which impounds the 360,000-acre-foot (440,000,000 m 3) Hetch Hetchy Reservoir, providing water and power to the City of San Francisco. The Hetch Hetchy hydroelectric system diverts large volumes of water into tunnels that feed two hydroelectric plants, the Kirkwood and the Moccasin.
In 1999, the Club created a separate non-profit organization called Restore Hetch Hetchy (RHH). Because the reservoir in Hetch Hetchy is part of a water-diversion and electric-generating system on the Tuolumne River that includes the much larger downstream reservoir, Don Pedro (51% funded by the San Francisco Public Utilities Commission), as ...