San Francisco voters will be weighing in on a big environmental question involving the city's water supply. It's stored at Hetch Hetchy Reservoir in Yosemite Park. Backers of Measure F aim to eventually drain the reservoir and restore the Yosemite Valley, fulfilling a dream dating back to environmentalist John Muir. But critics, including Mayor Ed Lee and Senator Dianne Feinstein, see disaster if it passes.
Century-Old Battle Over Hetch Hetchy Heats Up
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