Battalion Chief Brett Waters of Southside Fire and EMS says a boat hit something in the Ogeechee River on Saturday night, knocking off the motor.
The boat overturned, dumping its passengers into the river.
William Rodewolt, who lives along the river, tells WSAV-TV he heard screams and saw men in the water hanging on to a floating cooler. He began rescuing people in a boat.
Three people were taken to a hospital and treated for hypothermia. Fire officials say one person was in the water for almost an hour.