SAN BERNARDINO (CBSLA.com) — Crews gained the upper hand on a vegetation fire near the 15 Freeway in San Bernardino County by mid-afternoon Monday.

READ MORE: Arrest Made In Venice Arson Fires, Investigators Looking For Second Man

Crews with San Bernardino County Fire along with the U.S. Forest Service responded around 1:45 p.m. to the vegetation fire at Lytle Creek Road north of I-15 in the city of Fontana, according to County Fire.

The blaze quickly grew to as big as 75 acres by 3 p.m., but Bill Peters with Cal Fire told KNX 1070 NEWSRADIO the flames are moving toward less-populated areas near the edge of the San Bernardino National Forest.

“A lot of it is burning into the rock right now, so it’s probably looking very good for us as we go into the afternoon,” Peters said.

READ MORE: Gusty Santa Ana Winds Topple 2 Trees On Same Sylmar Property

Some structures were reportedly threatened, but no evacuations had been ordered, fire officials said.

Traffic was diverted off the northbound and southbound I-15 at Glen Helen Parkway, according to California Highway Patrol. Officials reopened the northbound freeway by mid-afternoon.

No other information was immediately available.

MORE NEWS: CBS2 Morning Team Challenges KPIX To TikTok Bet Over Rams-49ers NFC Title Game

LISTEN LIVE: Traffic Updates from KNX 1070 NEWSRADIO