Updated, 7:15 p.m. Wednesday:

The fire is up to about 550 acres. It's burning 1.5 miles west of Highway 17 and south of Highway 172.

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MANSFIELD — An approximately 100-acre grass fire has been reported west of Road P Northeast and north of Road 9 Northeast.

The fire is moving north, but isn't threatening any structures. No roads are closed.

Douglas County Fire Districts 3 and 5 and Chelan County Fire District 7 are on scene.