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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.
The aqueduct is the sole water supply for about 1.4 million people in the East Bay. [1] Under present water rights agreements, EBMUD can withdraw up to 325 million gallons (1,230,000 m 3) per day, or 364,000 acre-feet (0.449 km 3) per year, from the Mokelumne River.
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]
O'Shaughnessy Dam is a 430-foot-high (131 m) concrete arch-gravity dam in Tuolumne County, California, United States.It impounds the Tuolumne River, forming the Hetch Hetchy Reservoir at the lower end of Hetch Hetchy Valley in Yosemite National Park, about 160 miles (260 km) east of San Francisco. [6]
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]
The Hetch Hetchy Valley is in the northwest corner of Yosemite National Park, which was established in 1890. Even before the establishment of Yosemite National Park, the city of San Francisco began considering the Tuolumne River and Hetch Hetchy Valley as a possible location for a reliable water source. This sparked a social and political ...
The water impounded by the dam was held while the aqueduct to San Francisco was completed. He held the post of city engineer until 1932, when a new city charter was adopted, and he was subsequently appointed to the role of Consulting Engineer for Hetch Hetchy Water Supply by the San Francisco Public Utilities Commission. [8]
Moccasin Dam is a small dam on Moccasin Creek in Tuolumne County, California, in the town of Moccasin, west of Yosemite.It holds the Moccasin Reservoir.The dam, reservoir and associated hydroelectric power plant are part of the Hetch Hetchy Project, which provide water and power to the city of San Francisco.