The Boulder County Parks and Open Space department is burning about 300 piles of slash at Reynolds Ranch and Mud Lake, which will smolder through Sunday.

Reynolds Ranch is located south of the town of Nederland, and many of the slash piles are near Magnolia Road.

Mud Lake open space is located north of Nederland off of County Road 126J, and the burning piles there will not affect public access, according to the open space department.

The slash piles are from forest thinning projects that began in 2004.