A swimmer was airlifted to Adelaide after being struck by a boat in the River Murray at Mannum last night.
Emergency services raced to Mannum just before 7pm on Sunday 26 January after reports a boat had collided with a swimmer.
The 20-year-old Mannum woman was taken to the local hospital before being airlifted to Adelaide with serious injuries.
The driver of the boat, a 43-year-old West Lakes Shore woman, was arrested and charged with cause harm by dangerous use of a vessel, operate vessel without due care and operate vessel with prescribed concentration of alcohol - after she allegedly returned a positive reading of 0.142. She was refused police bail and will appear in the Murray Bridge Magistrates Court on Tuesday.
Investigations are continuing. Anyone who witnessed this incident or has footage that may assist the investigation is asked to contact Crime Stoppers at www.crimestopperssa.com.au or 1800 333 000.