SA's State Emergency Service have issued a watch and act warning for residents of Hope Forest, a town of about 150 people 40km south of Adelaide.
The dam is at a high risk of failure, the SASES said in a statement, and properties near the intersection of Bevan Road, Phillips Road and Verrall Road in the vicinity of Brookman Road could be subject to sudden flooding.
Emergency services issued more warnings over the weekend, with the danger zone spreading overnight on Saturday and into Sunday morning.
People living in the vicinity of Brookman and Decaux Roads are also being warned they may have to leave quickly if the waters rise.
Road closures will be put in place for Bevan Road, Verrall Road, Phillips Road, Brookman Road and Decaux Road.
Residents are being urged to monitor weather conditions and warnings, follow emergency plans and prepare for flooding.
The weather warning are expected to stay in place as a series of troughs associated with a slow-moving, deep low pressure system to the south of the state moves across the central parts.
The Bureau of Meteorology has severe weather warnings in place for parts of South Australia, with a 102 km/h wind gust recorded at Murray Bridge on Saturday evening.
The warning said winds up to 100 km/h over the Mount Lofty Ranges would ease on Sunday afternoon, but the risk of falling trees is high after recent heavy rain.
The BOM said on Sunday morning other locations which could be affected by damaging winds included Mount Barker, Murray Bridge, Victor Harbor, Strathalbyn and Mannum.
"Damaging wind gusts are expected to ease below warning thresholds during Sunday afternoon," the alert stated.
"Recent rainfall has led to saturated soil, so trees may be more susceptible to strong and gusty winds."
The bureau also issued flood warnings for parts of the North West and North East Pastoral Districts ahead of more rain lashing South Australia.
Showers and increasing rain are forecast to develop from Monday, with flooding possible from Tuesday.
The weather bureau warned that communities may be cut off with roads, travel and transport being affected.
For SES assistance phone 132 500 and if the matter is life threatening call triple-zero.
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