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FRESNO, Calif. (AP) — A blaze in the rugged mountains outside of Yosemite National Park is threatening 1,500 structures and forcing thousands of nearby residents to flee their homes as it rages toward a historic Gold Rush era town.

The Detwiler Fire burning near Highway 49, a historical route winding its way up California foothills of the western Sierra Nevada dotted with communities and landmarks that sprouted up during the state’s Gold Rush.

As of Wednesday morning, the fire had scorched more than 45,000 acres, or 71 square miles, according to the California Department of Forestry and Fire Protection. It was only 7 percent contained. The blaze burning since Sunday was making its way to the hills on the edge of Mariposa, a town of about 2,000 people under a mandatory evacuation order. About 5,000 people from a half-dozen communities are under evacuation order.

No injuries have been reported, but the fire has destroyed eight structures. It is unclear what type of structures were destroyed.

Record rain and snowfall in the mountains this winter was celebrated for bringing California’s five-year drought to its knees, but it has turned into a challenge for firefighters battling flames feeding on dense vegetation, officials said.

“There’s ample fuel and steep terrain,” said California Department of Forestry and Fire Protection spokeswoman DeeDee Garcia. “It makes firefighting difficult.”

The Northern California blaze is also threatening powerlines that provide electricity to the park, officials said. The park remained open Wednesday but several roads frequented by tourists were closed.

The wildfire near Lake McClure, a reservoir about 50 miles east of Modesto had at least 1,400 firefighters battling it on the ground and from the air.

Joey Street, 49, a tree trimmer who’s lived in Mariposa for about 25 years, was among the people who were first evacuated to a Red Cross makeshift shelter set up at Mariposa Elementary School, which was later closed.

“(Firefighters) don’t have control of it now, so they’d better be safe than sorry,” Street told the Fresno Bee while waiting to be bused to an evacuation center in nearby Oakhurst.

Gov. Jerry Brown on Tuesday declared an emergency, bolstering the state’s resources to battle the fire that he said has forced thousands of residents to flee and is expected to continue burning.

The cause of the blaze remains under investigation.

Smoke from the fire in Mariposa County drifted more than 150 miles away to Reno.

In a remote northeastern corner of Nevada, roughly 14 homes were damaged or destroyed by a wildfire that started Monday. Officials have lifted an evacuation advisory, allowing hundreds of people to return home and assess damage, authorities said.

Wind is driving the flames through invasive cheat grass — growing twice the norm, U.S. Bureau of Land Management spokesman Greg Deimel said.

“It is very thick, very dense,” he said. “You get the winds and the density of the grass, the fire just goes.”

(© Copyright 2017 The Associated Press. All Rights Reserved. This material may not be published, broadcast, rewritten or redistributed.)

(© Copyright 2017 The Associated Press. All Rights Reserved. This material may not be published, broadcast, rewritten or redistributed.)

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