Qld floods recede but more rain to come

Floodwaters are receding in some parts of north Queensland while other parts expect to be isolated for at least another month.

Floodwaters at Ingham, north of Townsville, are retreating as the Herbert River drops to 11.7m, from a peak of 12.25m.

But authorities fear this could be short lived as a monsoon trough moves through the area.

The weather bureau's senior forecaster John Hall said Ingham and surrounds would continue to receive isolated heavy showers from a monsoon trough that is stemming from a low system west of Mount Isa.

"There will be heavy falls later this week. We'll be monitoring this but can't say whether it'll fall over any particular catchments," Mr Hall told AAP.

He said it was possible the rain could force river levels to rise again.

About 41 people remain at the evacuation centre at Ingham, including nine children and three babies.

Queensland Fire and Rescue Service swift water rescue technicians, 11 police, six Emergency Management Queensland staff, four nurses and three Salvation Army personnel will fly into Ingham to relieve current staff.

Emergency services and the RAAF are flying in rations to the Ingham area.

Meanwhile, more heavy rain is forecast for the Gulf of Carpentaria in Queensland's far northwest which has been cut off by floodwaters for five weeks.

The Carpentaria Shire Council expects more rain could isolate residents for another six to eight weeks.

Two-thirds of Queensland is flooded with a total of 36 council shires declared disaster zones.

The damage bill is being estimated to top $187 million.

In north Queensland, emergency services resumed a search for three missing people in floodwaters, including a boy feared taken by a crocodile.

The five-year-old followed his dog into floodwaters during a walk with his seven-year-old brother at Cape Tribulation at the Daintree about 9.30am (AEDT) on Sunday.

Grave fears are held for his safety.

Police said the brother saw a large crocodile near where the boy disappeared.

Bad weather and poor light forced police to suspend the search on Sunday night but it resumed at first light on Monday.

National Parks and Wildlife officers are assisting police.

The search for two 34-year-old men feared drowned in floodwaters at Silky Oak, south of Tully, also resumed on Monday morning.

The men were in a vehicle with five others when it was swept away by floodwaters on the Bruce Highway at 9.30am on Sunday.

The five others were rescued.