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The fire on the east shore of Yellowstone Lake is growing and park officials are working to reroute backpackers and others who were headed there over the next few days. 

Yellowstone National Park said in a news release Thursday afternoon that the Brimstone fire grew to about 80 acres on Wednesday night, making it the largest fire in the park so far this year. Park staff are working to reroute backpackers around the burning area, the release said.

Rebecca Roland, a park spokeswoman, said fire staff and law enforcement were trying to contact 44 people and three stock parties who were scheduled to be in the area Thursday, Friday and Saturday. They were also trying to contact people who were scheduled to be at the sites on Wednesday night. 

Two groups had gotten shuttles out of the area by Thursday afternoon, Roland said.

The release announced the closure of seven backcountry campsites — 5E1, 5E2, 5E3, 5E4, 5E5, 5E6 and 6B4 — and the Thorofare Trail between campsite 5E8 and Beaverdam Creek.

The fire was detected Monday afternoon. The release said it was likely caused by lightning. It's chewing up spruce and fir trees. Park officials are monitoring the fire and making long-term plans for dealing with it. 

Smoke can be seen from Bridge Bay, Lake Village, Fishing Bridge and the East Entrance Road.

Fire danger in the park is "high," but there are no fire restrictions. Four other fires are active inside the park's borders, but the Brimstone is now the largest.

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Michael Wright can be reached at or at 406-582-2638. Follow him on Twitter @mj_wright1.