The driver has died after a red pickup truck veered off the road about noon Monday and flipped over into Horseshoe Lake near Granite City.
Anglers pulled the driver, identified only as a 45-year-old woman, from the vehicle and an ambulance took her away to an area hospital. But she was unable to be revived.
Police, as of Tuesday morning, haven't said what caused the accident or what, specifically, caused the woman's death.
The accident was near the bait shop in Horseshoe Lake State Park.