It is the largest of three fires burning in the region, likely caused by lightning strikes Friday night or early Saturday morning.
The other two are the Powerline Fire and the Corral Creek Fire in Idaho, about 30 miles south of Lewiston.
The Powerline Fire swelled from about 400 acres to 1,500 acres Sunday, while the Corral Creek Fire was more stable, growing only by about 100 acres to 800 acres, according to a news release from the Idaho Department of Lands.
No structures have burned, and no evacuations have been ordered on any three of the fires. Read more.