YOLO COUNTY (CBS13) — Crews have contained a grass fire that has burned 1,800 acres in rural Yolo County.

The fire was burning in the Fremont Weir Wildlife Area, about 16 miles northeast of Woodland.

READ MORE: Suspect In Custody After Shooting At House Of Oliver In Roseville

Yolo County Fire officials say crews were dispatched to the scene around 10 p.m. Wednesday, but they believe the incident started a little before that time.

READ MORE: Forward Progress Stopped On Fire In El Dorado Hills

Exactly what started the fire is unclear.

MORE NEWS: 1 Person Dead After Carmichael Shooting

Few homes or other structures are in the area.