WAYNESVILLE, N.C. (WNCN) — A large North Carolina mountain wildfire that was sparked during a tractor-trailer crash on Interstate 40 grew a third in size on Saturday — starting the day at nearly 1,200 acres and expanding to just under 1,800 acres by 9:30 p.m.

The fire began around 9 a.m. Thursday in Haywood County on I-40 at mile marker 3 near the tunnel after a tractor-trailer overturned in the westbound lanes near the Tennessee border, according to the U.S. Forest Service and the North Carolina Department of Transportation.

U.S. Forest Service photo showing the fire along Interstate 40 in far western North Carolina.

The blaze, called the Black Bear Fire, was still burning Saturday in rugged terrain at mile marker 3, in Haywood County in the Appalachian Ranger District of the Pisgah National Forest.

So far, the fire has scorched 1,193 acres and is 0 percent contained, the U.S. Forest Service said Saturday afternoon. At 9:30 p.m. Saturday, the Forest Service said the fire had burned 1,790 acres

“The fire spread in vegetation north of the highway and rapidly progressed up steep slopes, partially driven by southeast winds,” the North Carolina Forest Service said.

Fire officials said some parts of I-40 could be closed and drivers should “expect delays,” crews said Saturday evening.

“Expect smoke when driving along I-40 near the fire,” U.S. Forest Service officials said Saturday.

The Appalachian Trail is closed from Interstate 40 to Max Patch and road closures are in effect for Cold Springs Road and Brown Gap Road.

As of Saturday, 166 people were working to contain the fire along with three helicopters. One fire engine and a bulldozer are also working to stop the Black Bear Fire.

Crews are setting containment lines of Interstate 40 on the southwest, the Appalachian Trail from I-40 to Groundhog Creek Shelter along the north, and Forest Road 3580 on the east-south to I-40.

NC DOT photo showing the wrecked tractor-trailer in the distance and smoke from the fire that quickly spread.

Meanwhile, the Collette Ridge Fire that was sparked by a lightning strike on Oct. 23 has burned 5,505 acres and was at 82 percent contained on Saturday.

So far, 223 people have worked to stop the large fire in Cherokee and Clay counties.

For now, only about 20 crews are working and two helicopters are assigned to the Collette Ridge Fire.