Fire spokesman Rick Scriven said Thursday evening that the Mills Canyon fire near Entiat has burned across more than 18,000 acres since it started Tuesday. Residents of about a dozen homes have been told to evacuate, while more than 200 other homes are threatened.
A stretch of U.S. Highway 97A has reopened after being closed for 24 hours by the fire.
About 40 miles away, on the west side of Lake Chelan, the new 25-Mile Fire quickly burned across 350 acres by Thursday evening. Some residents have been told to leave their homes.
Near Spokane, a wildfire that has burned about 1 square mile is reported 80 percent contained.