A severe thunderstorm and strong winds swept Mistletoe State Park Friday afternoon, toppling 50 to 60 trees, knocking over some vehicles and campers and sending at least one person to the hospital. A 5-year-old girl was taken to the hospital with a broken arm. She was injured when a tree fell on a camper. Pam Tucker, director of Columbia County emergency services, said others were evaluated at the scene and treated for minor scrapes.