Adelaide Hills residents have been urged to sandbag their homes and prepare for flooding as rain continues to drench the region.
The State Emergency Service says the Upper Onkaparinga River catchment is rising and minor flooding is expected in surrounding areas.
A watch and act message was issued for the area on Monday with the towns of Lobethal, Hahndorf, Verdun and Woodside most at risk.
"We're asking people in that area to make preparations and put their emergency flood plan in place," an SES spokeswoman said.
"So put sandbagging in place, move valuables to a safer place and monitor the media for updates."
One creek at Lobethal burst its banks on Monday morning, sending water on to the road.
Up to 100mm of rain is forecast for the Hills over Monday and Tuesday, with more than 28mm already recorded since Sunday night.
The area remains of most concern for emergency crews as floodwaters in the South Australia mid north stabilise.
But the mid north is not entirely out of trouble with the Gawler River catchment still rising.
"We're probably not expecting too much too happen out there but we're still asking people to be vigilant," the SES spokeswoman said.
The other area of concern is Port Wakefield as if it floods it will impact people returning to the city from the Yorke Peninsula after the long weekend.
"We're going to have a lot of holidaymakers making their way home through that area," she said.
"So people travelling in that area are asked to plan their trip because the situation is constantly changing."
Prime Minister Malcolm Turnbull will visit Virginia, north of Adelaide, on Monday afternoon after Opposition Leader Bill Shorten met with emergency workers in nearby Roseworthy in the morning.
