Smoke from the Rim Fire lingers over the O'Shaughnessy Dam at Hetch Hetchy Reservoir on August 24, 2013 in Yosemite National Park.
Last month, Gov. Brown declared a state of emergency for San Francisco because of the Rim Fire's encroachment on an area around the Hetch Hetchy reservoir. Planes have dumped more than 2 million gallons of fire retardant nearby. Still, utility officials say there's no reason to worry. Reporter: Grace Rubenstein
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