COTTONWOOD, Minn.—A Willmar man was arrested on drug charges after a traffic stop in Cottonwood, according to the Lyon County Sheriff’s Office. At approximately 12:01 AM on Tuesday, deputies performed a traffic stop near the intersection of North Barstad Road and West Front Street in Cottonwood. After investigating, a 20-year-old Willmar man was arrested for 5th degree possession of a controlled substance.