People living on properties downstream from a failing Queensland dam have evacuated amid a real risk of dangerous flooding.
Engineers are assessing a 3.5m hole in the dam on private property at Talgai, north of Warwick, but efforts to repair the damage have so far failed.
Residents on nine properties self-evacuated last night after the Southern Downs Regional Council issued an emergency alert.
The council has warned the failure of the Bolzan Quarry Dam would result in "dangerous downstream flooding in low lying areas".
An evacuation centre was opened at Warwick, but has closed as the evacuees have sheltered with family or friends.
Authorities are using drones to assess the damage, says Southern Downs Regional councillor Cameron Gow.
They hope to find a way to relieve the pressure on the wall of the dam, which is filled to capacity after heavy rains.
"A wall failure is a real concern," Mr Gow told AAP.
Mr Gow said water was "venting" from the 3.5m by 1.5m hole at the dam's base.
The property owner notified emergency services of the hole in the 430 megalitre agricultural dam on Friday afternoon.
He is working with engineers and emergency services from a control centre near the dam.
Meanwhile, showers and thunderstorms are expected to break a severe heatwave that has gripped much of northern Queensland.
Forecasters say the sweltering conditions will peak today and ease from tomorrow, while the rest of the state gets some much needed sunshine.
Days of downpours in the southeast corner have led to flooding that is yet to subside.
The Bureau of Meteorology says there's a medium chance of afternoon showers and thunderstorms for the southeast over the weekend, but nothing like the deluge earlier in the week.
On the Gold Coast, police are still searching for Yang Chen, 26, who disappeared in the hinterland area while walking near Gorge Falls in the Tallebudgera Valley earlier in the week.