(Associated Press) 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 they want a plan for draining the 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 geologic sibling.

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