The Douglas County Sheriff's office is investigating a drowning after a 71-year-old woman was found dead in Lake Amnicon Thursday morning.

Authorities were called at approximately 8:59 a.m. to the Finn Point Road area near Lake Amnicon because the woman had gone swimming earlier and couldn't be found, a news release from the sheriff's office said.

Her body was found in shallow water about 100 yards from the dock where she entered the water.

Foul play isn't suspected, the sheriff's office said. The sheriff's office and the Douglas County Medical Examiner are investigating the death.

Lake Amnicon is a few miles south of Pattison State Park.