Three state helicopters are in route from Helena to help ground crews fight a 3,000 acre wildfire burning in Gallatin County, north of Logan.

Witnesses in the area said they first spotted the fire around 12 p.m. Smoke plumes from the fire were reportedly visible from I-90, west of Bozeman.

By 1:30 p.m., the fire had grown to over 3,000 acres, according to the Helena Interagency Dispatch Center.

A helicopter pilot flying overhead reported the fire to be over 6 miles long, and approximately 1 mile wide.

Multiple agencies are responding. At 1:30 p.m., it was unclear whether any structures were threatened.

Officials are asking people in the area who see the fire not to stop in order to allow fire crews room to operate.