what was the purpose of the hetch hetchy reservoir
Hetch Hetchy 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 (269Â km) west to San Francisco and its client municipalities in the greater San Francisco Bay Area.