(Portage) A motorcyclist was killed in the City of Portage Sunday. The 39-year-old biker lost control heading westbound on Highway 33 near East Cook Street around 4:15pm. The motorcycle and the operator crossed into the eastbound traffic lane and were struck by a tractor-trailer. The motorcyclist was pronounced dead at the scene. The driver of the semi was uninjured. The crash is being investigated by the Wisconsin State Patrol. Assisting the Portage Police Department was the Wisconsin State Patrol, Columbia County Dispatch, Columbia County Medical Examiner Office, Portage Fire Department, and Blystone’s Towing.