Associated Press
FILE - This pre-1913 file photo shows the Hetch Hetchy Valley in Yosemite National Park, Calif. This fall San Franciscans will vote on a local measure with national implications: it could return to the American people a flooded gorge described as the twin of breathtaking Yosemite Valley. Voters will decide whether to drain a 117-billion-gallon Hetch Hetchy reservoir in Yosemite National Park, exposing for the first time in 80 years a glacially carved, granite-ringed valley of towering waterfalls 17 miles north of its more famous sibling. (AP Photo/Bancroft Library via Environmental Defense, File)

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