A cikin 1923, an kammala O'Shaughnessy Dam akan kogin Tuolumne, wanda ya mamaye kwarin duka a ƙarƙashin Tafkin Hetch Hetchy.Dam da tafki sune cibiyar aikin Hetch Hetchy, wanda a cikin 1934 ya fara isar da ruwa mai nisan mil 167 (kilomita 269) yamma zuwa San Francisco da kuma gundumomin abokan cinikin sa a cikin babban yankin San Francisco Bay.
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Ziyarci Shago
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