They called it an engineering marvel, and it was, even by today's standards.The aqueduct project to bring fresh water 160 miles - from the Sierra Nevada's Hetch Hetchy Valley to the Bay Area - took 24 years to build and cost $102 million and the lives of dozens of construction workers.On Oct. 28, 1934, crowds from San Francisco gathered on the Peninsula to see and hear the first bursts of mountain water.
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