The State Emergency Service website says a dam is failing at Echunga in the Adelaide Hills, prompting an emergency warning.
The SES said there was a threat to people’s safety and warned residents to prepare for flooding and follow their emergency plan.
Echunga is a small town in the Adelaide Hills, about 34 kilometers south-east of Adelaide.
The dam is located on farmland between Marianna St and Churchill Road.
If the road is clear, the SES has urged people to move to the homes of family and friends outside the warning area, or to Club de Futbol Echunga.
SA Police Senior Constable Kylie Simpson said up to 20 homes in the “high risk” area had been identified, but all residents had been notified.
State Emergency Services officer David O’Shannessy told ABC Radio Adelaide crews were asking people to move from the area.
“We are doing everything we can to mitigate that risk,” he said.
O’Shannessy said the dam holds about 10 megalitres of water.
The SES said floodwaters could rise quickly and were likely to move quickly, warning people not to walk, drive or wade through floodwater.
Several roads are closed including Aldgate-Strathalbyn Road to Echunga Road, Echunga Road to Aldgate-Strathalbyn Road, Battunga Road to Meadows Road, Strathalbyn to Sophia Street and Churchill Road to Old Mount Barker Rd.
More to come.