Police have closed the Mount Lindesay Highway.
The road is cut at Jimboomba Creek, north of the town.
Motorists can still take Tamborine Road, Edelsten Road and Camp Cable Road.
The Logan River is expected to peak over the weekend, with a one in five year event forecast in the lower reaches.
The Albert River is expected to peak this afternoon, resulting in a less than one in 10 year event, Logan City Council said.
There were 18 power outages reported overnight - 13 in Chambers Flat and five in Munruben.