The fire began Tuesday and is burning about 5 miles north of the town. About 200 people have been assigned to the fire.
The Kuskokwim River separates McGrath from the fire, which isn't likely to reach the town of roughly 300, said Andy Alexandrou, public information officer for the Department of Natural Resources.
The fire is the largest of a series of wildfires started by lightning Sunday and Monday. Firefighters are also battling a 1,200-acre fire about 20 miles southeast of Sleetmute and a 235-acre fire roughly 12 miles from Lime Village.
The fires aren't considered to be a threat to Lime Village or Sleetmute, Alexandrou said.
Important warning about e-mails purporting to be from the adn.com staff.