A wildfire burning on the northern border of Yosemite National Park grew more than 7 square miles overnight as firefighters have gained little ground in slowing it down. The fire has continued to spread and covers
almost 230 sq miles (600 sq km), officials say.
The Rim Fire is now raining ash on a key reservoir that supplies water and
hydro-electric power to San Francisco. City officials say they are moving water to lower reservoirs and monitoring
supplies for contamination.
The blaze is also threatening thousands of homes and some of California's
renowned giant sequoia trees. On Monday officials said the fire was 15% contained after burning for more
than a week - up from 2% containment on Friday. Strong winds are making the fires more difficult to control.
"This fire has continued to pose every challenge that there can be on a
fire," said Daniel Berlant of the California Department of Forestry and Fire
Protection. The blaze began on 17 August in the Stanislaus National Forest but the cause
is still unknown.
Some 2,800 firefighters are tackling the flames in difficult terrain. Evacuations, some voluntary and some mandatory, are taking place. Despite the
threat to some 5,000 homes, only a few have been destroyed. California Governor Jerry Brown has declared a state of emergency for San
Francisco 150 miles (220km) away as the blaze is also threatening power lines
that bring electricity to the city.
Ash is said to be falling like snow on the Hetch Hetchy reservoir, which
supplies San Francisco with 85% of its water. Visibility in the smoke-ridden
area is down to 100ft (30m), but officials say the water quality is still
good.
"The water we are receiving is still of good quality,'' said Harlan Kelly Jr,
general manager of the city's Public Utilities Commission. "We're bringing down as much water as possible and replenishing all of the
local reservoirs."
2800 firefighters continue to fight
5000 homes are being threatened
Steep slopes make it difficult to dig ditches to create breaks
It is the sixteenth largest fire in California's history
Two of three hydroelectric power stations serving the
city were shut down, forcing the San Francisco Public Utilities Commission to
spend $600,000 buying power on the open market.
The blaze reached the park's backcountry at Lake Eleanor on Friday. But it
remains some 20 miles away from Yosemite's main tourist area. The park authorities say they
have no plans to close the attraction as most of Yosemite, which hosts up to
15,000 visitors a day in the summer, is unaffected by the fire.
Areas on the north-western edge of the park, including that round the Hetch
Hetchy reservoir and Lake Eleanor, have been closed throughout the week. A stretch of motorway, Highway 120, which is one of three entrances to the
west side of the park, remains closed. Visitors are being urged to use
alternative routes from the west.
The Rim Fire is one of 50 major wildfires burning in the western US. Lack of
rain and snow have made it a bad year, with 5,700 fires being tackled so far.
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