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.

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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.

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Exactly what started the fire is unclear.

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Few homes or other structures are in the area.