California's Hetch Hetchy Aqueduct, completed in 1936, delivers about 85% of the water used in the San Francisco Bay area. Originating over 160 miles away, at Yosemite's Hetch Hetchy reservoir, and working chiefly by gravity, a 21 mile section of two pipelines crosses the South Bay via a series of underground tunnels and bridges just south of the Dumbarton Bridge. This bridge section, near the end of its useful life, has recently been augmented by a deep tunnel.Infrastructure is heroic.
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