A wildfire in Okanogan County quadrupled in size on Monday, prompting warnings to property owners and campers around Alta Lake State Park.

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CHELAN — A wildfire northeast of Chelan has burned across an estimated 4,000 acres — about six square miles.

Fire-management spokesman Jeff Sevigny said Monday night that residents of about 50 homes have been warned they may have to evacuate. Most homes are in the community of Alta Lake. So far, no structures have burned.

He said Alta Lake State Park has been closed.

The Antoine Creek Fire is about 40 percent contained, Sevigny said, with no estimate on full containment.

About 350 firefighters are at the scene. The fire, which has been burning grass and light timber, was reported around noon Sunday near Apple Acres and Antoine Creek roads.

Firefighters on Sunday morning contained another fire ignited by a campfire left unattended in Schaefer Creek off the Chiwawa River Road. On Sunday, the Crane Road fire near Bridgeport, Douglas County, was 95 percent contained.

A Douglas County Sheriff’s Office investigation found that the fire was started by orchard crews burning weeds. The fire blackened 12,000 acres.

The Wenatchee World contributed.