The Wisconsin Department of Natural Resources’ conservation wardens are jointly investigating a fatal snowmobile accident that occurred on Lake Winnebago on Saturday. The crash occurred on the frozen-over Lake Winnebago about 4:30 p.m. around Stockbridge in Calumet County. It involved a single snowmobile with a lone operator. The crash left the operator deceased. The Calumet County Sheriff’s Office and Calumet County Coroner are handling the official identification and notification of survivors. Alcohol and speed are possible factors. There were also snowmobile accidents in Iron County and Langlade County as a two sleds ran into two vehicles, in Dunn County they are investigating a fatality as the sled went off the trail and the operator was ejected and in Forest County two sleds were operating on Pickeral Lake when the passenger and operator on the lead sled was ejected and the passenger on the lead sled was struck by the other operator. That passenger later succumbed from their injuries.