Snake fears after Aussie floods

Emergency services are stocking up on anti-venom medication following reports of snakes in flood-bound St George in southwest Queensland.

Floodwaters are slowly falling at St George but the Department of Community Safety say snakes trying to find dry ground are prevalent.

"Anti-venom stocks have been re-supplied following reports of increased numbers of snakes in the area," the department said in a statement on Tuesday morning.

There have also been seven snake bites in New South Wales since last Thursday.

Up to 20 homes remain flooded at St George and roads continue to be cut off with only heavy vehicles able to get in and out.

Floodwaters are also dropping at Roma and Charleville, where the mop-up continues, but further south the border towns of Dirranbandi, Hungerford and Hebel are bracing for river levels to peak.

The water is moving very slowly to NSW and continues to isolate at least 20 towns and will do so for several more weeks.

The weather bureau says the Balonne River is expected to reach a peak of 5.3 metres at Dirranbandi on Tuesday after reaching 5.2 metres on Monday afternoon.

"We are watching river levels closely at Dirranbandi, Hungerford and Hebel (in southwest Queensland) and Moura and Baralaba on the Dawson River (in central Queensland)," said Bureau of Meteorology spokesman Ian Rocca.

"There will be major flooding all down there. The river (at Dirranbandi) should be close to its peak."

Work to raise the levee protecting Dirranbandi from being flooded is continuing and food drops are expected on Tuesday.

The small town of Meandarra, west of Toowoomba, remains isolated with about half of the town resembling an inland lake.

Water levels in Theodore, on the Dawson River in central Queensland, are dropping but the town remains isolated.

Only two houses have been inundated while about 20 others are reporting water in their yards, emergency services said.

Thirteen people, including eight Vietnamese tourists, took refuge at the town's evacuation centre on Monday night.

Flood levels at Thargomindah have steadied around 6.44 metres but it also remains isolated.

- AAP