In 1910, voters in San Francisco approved a $45 million bond issue for the construction of a water system on the Tuolumne River.
In 2010, city residents could vote on a proposal to tear out a key part of the system — Hetch Hetchy Reservoir in Yosemite National Park.
Restore Hetch Hetchy, the group leading the effort, aims to get the measure on the November ballot.
A vote in favor would not spring the wrecking crew into action, as the city still would have to find alternatives for storage, possibly in an enlarged Don Pedro Reservoir.
But passage would make it clear that San Franciscans want Hetch Hetchy Valley restored to its pre-dam splendor, said Mike Marshall, the group's executive director.
"If we get it on the ballot, it will be a bit of a game-changer," he said.
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