Hetch Hetchy Reservoir
When Congress approved the O'Shaughnessy Dam in 1913, pragmatism triumphed over aestheticism. Some 2½ million residents of the San Francisco Bay Area continue to get their water from this 117-billion-gallon reservoir. Although spirited efforts are being made to restore the Hetch Hetchy Valley to its former, pristine glory, three-quarters of San Francisco voters in 2012 ultimately opposed a measure to even consider draining the reservoir. Eight miles long, the reservoir is Yosemite's largest body of water, and one that can be seen up close from several trails.
