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Yosemite fire grows to 4th-largest in state history

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The Rim fire burning in and around Yosemite National Park became the fourth-largest blaze in California history as it grew to 348 square miles Sunday, officials said.

The wildfire, which began Aug. 17, is 40% contained with more than 5,000 firefighters battling the flames, according to the U.S. Forest Service. A September 1932 fire in Ventura County that burned 343 square miles previously held the spot, Cal Fire said.

U.S. Forest Service hotshot crew sets up camp as the Rim fire burns about three miles east of Tuolumne City, Calif. (By Don Bartletti / Los Angeles Times)

U.S. Forest Service hotshot crew sets up camp as the Rim fire burns about three miles east of Tuolumne City, Calif. (By Don Bartletti / Los Angeles Times)

San Diego’s 427-square-mile Cedar fire in Oct. 2003, which destroyed more than 2,800 structures and killed 14, remains the largest wildfire in state history. The blaze began as a signal fire set by a West Covina man who was separated from his companion on a deer hunting trip, according to Times archives.

Crews are making good progress on the Rim fire, particularly on the northwest side of the blaze, though local winds sparked new spot fires and the fire is continuing to expand to the northeast, said U.S. Forest Service spokesman Trevor Augustino.

Winds have declined from earlier in the week, and a short rain shower Saturday night and higher humidity levels have helped mitigate some of the fire danger, he said.

“Any rain we get would be a tremendous asset,” he said, adding that the drought conditions and rugged, remote terrain have been challenging for firefighters.

Wind shifts on Friday dumped smoke into the Yosemite Valley, which appeared hazy with decreased visibility on video streaming from webcams the park. Another shift in the wind is expected Monday or Tuesday, which should help clear the smoke out of the area, said park ranger Kari Cobb.

There has been a noticeable decline in visitors to the park, she said, partly because of the fire’s smoke but also because of road closures in the park.

Park officials are advising visitors to avoid strenuous activity and for those sensitive to smoke to avoid being outside.

The Rim fire has destroyed 111 structures, 11 of them residential, and is expected to be contained Sept. 20, said Cal Fire spokesman Daniel Berlant. No structures inside the national park have been lost, Cobb said.

Battling the blaze, the largest in California this year, has so far cost $60 million in state and federal funds, Augustino said.

Six other fires are burning in California, down from about a dozen last week, with more than 8,000 firefighting personnel deployed across the state, Berlant said. Recent weeks have seen an increase in fire activity, he said, because of dry conditions, gusty winds and dry lightning that sparked several hundred fires.

Fire officials are advising those camping over Labor Day weekend to be cautious and aware of fire restrictions when lighting campfires.

Some fire crews are being released as they reach the end of their two-week assignments, but reinforcements will be brought in as needed, Augustino said. Many are local forces, he said, and are likely to be back after a few days of rest if they’re still needed.

Investigators are still trying to determine what caused the Rim fire, Augustino said, adding that progress had been made in the case but no additional details were available.

Todd McNeal, a fire chief in Twain Harte, told a community meeting that an illegal marijuana-growing operation could have sparked the fire, the San Jose Mercury News reported.

On Aug. 23, Gov. Jerry Brown extended a state of emergency to include the city and county of San Francisco because of a threat to utilities. Since the fire began, water quality at the Hetch Hetchy reservoir, which serves customers in the San Francisco Bay Area, is unchanged, according to the San Francisco Public Utilities Commission.

Read more at latimes.com