A flood evacuation warning is still in force for areas of Goulburn in the NSW southern tablelands despite an easing of heavy rain in the area.
The State Emergency Service says the quantity of water already in the river system continues to pose a threat of inundation.
Around a hundred homes were doorknocked earlier today to deliver the warning.
The SES has upgraded its flood warning for the Shoalhaven River to moderate, reflecting concerns for some areas of Nowra.
More than 100 millimetres of rain has fallen in the region in the past 24 hours, with another 50 millimetres expected today.
State Emergency Service (SES) spokesman Kevin Anderson says some roads are under water.
"There's a couple of areas in Goulburn, low-lying areas around Eastgrove, that have been closed and council has put up road barriers there," he said.
"In the rural areas there are just so many low-level crossings that it's impossible to close all the roads. So we just urge if people do see water across the road, don't drive through it."
Mr Anderson says evacuations may be necessary if the forecast rain arrives.
"If we get another 50 millimetres we'll be looking at some of the areas along the Wollondilly River to the north and west of Goulburn," he said.
"The rural locality of Towrang may become isolated today as the bridge off the highway gets cut."
SES region controller Tony Casey says residents are used to evacuation warnings following two major floods since 2010.
"There is no flood warning system here in Goulburn, so we're unable to give heights about when flooding is likely to occur or timings," he said.
"It's very much a matter of watching the rivers."
© ABC 2013
18:34 EDT A number of properties are in danger in the greater Sydney region after heavy storms and lightning in the area, as two Blue Mountains homes are destroyed by bushfire.