The fire is closing in on one hundred and fifty thousand acres and has burnt twenty-three buildings, including four homes.
Forty-five hundred more homes have been ordered evacuated due to the threat they are under.
Twenty-two thousand of the burning acreage is in Yosemite National Park, but authorities say that the main part of the park is not in any danger as it lies more than twenty miles away.
Most worries are focused on the Hetch Hetchy Reservoir and the O'Shaughnessy Dam, which are now less than half a mile from the flames.
San Fransisco gets eighty-five percent of it's water from the reservoir and significant amounts of power from the dam.
City officials say that they have adequate emergency reserves, should the water become reached by the smoke.
They are also doing hourly checks of water quality to ensure that contaminants from the fire are not reaching people's drinking water.
Power supply has already been interrupted, as some power lines have fallen victim to flames.
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