articleThe Brief A small plane crashed Sunday, Aug. 2 in Hay River Township, located in Dunn County, Wisconsin. A plane crash in Dunn County (Wis.) on Sunday sent two people to the hospital and has sparked an ongoing federal investigation. Plane crashes in Hay River TownshipWhat we know:The Dunn County Sheriff’s Office said the crash happened around 12:10 p.m. Sunday near Boundary Road, north of State Highway 170. First responders from Dunn County, Boyceville Fire Department, Glenwood City Ambulance, Menomonie Fire and Ambulance, and the Wisconsin State Patrol all went to the scene. The crash site was cleared after the plane was removed, but questions remain about what led to the crash.