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California wildfire continues to blaze - and can be seen from space

The cause has not been determined for the fire, but fire officials have expressed optimism about the situation.

CREWS ARE FINALLY gaining ground on a massive wildfire burning near Yosemite National Park as fire officials expressed optimism – even as the blaze grew larger, while containment jumped to 20 percent.

The fire has blazed so strongly that it is even visible from space, as this photograph from NASA shows.

imagePic: NASA

The BBC reports that the fire now covers almost 600 square kilometres.

As flames lapped at the edge of the main reservoir that supplies San Francisco, fears that the inferno could disrupt water or power to the city diminished.

“It looks great out there. No concerns,” Glen Stratton, an operations section chief on the blaze, said of the Hetch Hetchy Reservoir.

Firefighters

Nearly 3,700 firefighters battled the roughly 252-square-mile fire, the biggest wildfire on record in California’s Sierra Nevada.

Weather conditions forecast for tomorrow may bring challenges in the morning as heavy smoke settles low to the ground, limiting visibility, but higher humidity was expected in the afternoon which could help dampen the flames, said Matt Mehle, a National Weather Service meteorologist assigned to the fire.

imageA fire truck drives past burning trees as firefighters continue to battle the Rim Fire near Yosemite National Park. Pic: AP Photo/Jae C Hong

Crews remained confident they could protect hydroelectric transmission lines and other utility facilities at the reservoir, the chief source of San Francisco’s famously pure drinking water.

Utility officials monitored the basin’s clarity and used a massive new $4.6 billion gravity-operated pipeline system to move water quickly to reservoirs closer to the city.

So far the ash that has been raining onto the reservoir has not sunk as far as the intake valves, which are about halfway down the 300-foot O’Shaughnessy Dam. Utility officials said the ash is non-toxic but that the city will begin filtering water for customers if problems are detected.

imageSmoke clouds and bands of haze from the Rim Fire in the western Sierra Nevada loom up some 20 miles behind the famed granite monolith known as Half Dome in Yosemite National Park. Pic: AP Photo/Tami Abdollah

Power generation there was shut down last week so firefighters would not be imperiled by live wires. San Francisco is buying replacement power from other sources to run City Hall and municipal buildings.

It has been at least 17 years since fire ravaged the northernmost stretch of Yosemite that now is under siege.

Park officials cleared brush and set sprinklers on two groves of giant sequoias that were less than 10 miles away from the fire’s front lines, said park spokesman Scott Gediman.

imageThe Rim Fire burns along Highway 120 near Yosemite National Park. Pic: AP Photo/Jae C Hong

The fire has swept through steep Sierra Nevada river canyons and stands of thick oak and pine, closing in on Tuolumne City and other mountain communities.

It has confounded ground crews with its 300-foot walls of flame and the way it has jumped from treetop to treetop.

imageOperations section chief Glen Stratton points to the Hetch Hetchy Reservoir on the map. Pic: AP Photo/Jae C Hong

Crews spent Monday bulldozing firebreaks to protect Tuolumne City, several miles from the fire’s edge.

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Stratton said they would continue working to burn vegetation in the fire’s path to slow its march toward town. He said that while the community remains in harm’s way, “I’m pretty optimistic.”

Meanwhile, biologists with the Forest Service are studying the effect on wildlife. Much of the area that has burned is part of the state’s winter-range deer habitat. Biologist Crispin Holland said most of the large deer herds would still be well above the fire danger.

Biologists discovered stranded Western pond turtles on national forest land near the edge of Yosemite. Their marshy meadow had burned, and the surviving creatures were huddled in the middle of the expanse in what little water remained.

“We’re hoping to deliver some water to those turtles,” Holland said.

We might also drag some brush in to give them cover.

Wildlife officials were also trying to monitor at least four bald eagle nests in the fire-stricken area.

imageThe Hetch Hetchy Reservoir is hazy with smoke from the Rim Fire. Pic: AP Photo/Jae C Hong

While it has put a stop to some backcountry hiking, the fire has not threatened the Yosemite Valley. Most of the park remained open to visitors.

The US Forest Service said the fire was threatening about 4,500 structures and destroyed at least 23.

Rugged terrain, strong winds and bone-dry conditions have hampered firefighters’ efforts to contain the blaze, which began on August 17. The cause has not been determined.

Read: Yosemite fires cause tourists to flee national park>

Photos: Firefighters battle blaze near Yosemite National Park>

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