A NUMBER of central Queensland towns and hamlets are isolated by floodwaters for the second time in two months after torrential rain.

Rivers have broken their banks in the Banana, Gladstone and Fraser Coast regions today.

Banana Shire Mayor Ron Carrige says all roads leading to the town of Biloela are swamped by floodwaters.

"We're pretty well stranded at the moment," he told AAP.

"We're cut off north, south, east and west."

No homes or businesses are affected but there could be extensive damage in rural areas.

Some farmers had just started replanting after floods last month.

"I don't know how much more you can wreck things that are already wrecked," Mr Carrige said.

And the council isn't sure when the floodwaters will recede.

"I want to get home myself. All we can do is watch it and see," Mr Carrige said.

Southeast of Bileola, Maryborough is preparing for the Mary River to peak at 7m about 8am tomorrow.

The suburb of Granville is already isolated along with the nearby hamlets of Poona, Boonooroo and Bidwill.

Fraser Coast Mayor Gerard O'Connell says the expected peak is below January's level and will only impact a few businesses and homes.

"That's one small blessing we can count," he told AAP.

"But these flood events still have a huge impact."

The same river is slowly receding upstream at Gympie after peaking at 18.44m last night.

About 50 businesses and 30 homes and properties are flooded and Mayor Ron Dyne has urged sightseers to stay away.

"There have been reports of vehicles sending wash into businesses and causing further damage to evacuated premises, which is totally unacceptable," Mr Dyne said.

The Bruce Highway is likely to remain cut at Traveston, south of Gympie, until tomorrow morning.

Residents of Bundaberg, which last month was devastated by the worst floods in its history, are relieved after being told the Burnett River will not break its banks.

However, some areas further upstream are expected to see moderate flood levels.

Rockhampton Mayor Gail Sellers has warned that the Boyne and Calliope rivers and Baffle Creek could see minor to moderate flooding today and tomorrow.

The holiday town of Agnes Water is already cut off.

"This is hard because we haven't had time to get over the last lot of rain," Ms Sellers told ABC radio.

"People in the Baffle Creek area are still not back in their homes, so this is very difficult for them."