The public sector union, Together, says the 52-bed "bikie-only" prison at Woodford, north of Brisbane, is virtually empty with just one "bikie" prisoner, while the Maryborough jail remains over capacity.

The Queensland Government's "bikie-only" prison was established at the Woodford Correctional Centre in October last year and began taking inmates in December.

However, Together spokeswoman Allison Finley-Bisset says the Woodford facility is under-utilised.

"Last I heard is there's only one prisoner in the bikie unit at Woodford, even though that's a fully manned facility," she said.

In April, the Queensland Corrective Services Department confirmed the Maryborough Correctional Facility was over capacity by more than 35 prisoners.

Ms Finley-Bisset says with the Woodford facility almost empty, the State Government has its priorities wrong.

"The reality is you could put the prisoners that are making facilities such as Maryborough over capacity into that facility in that unit in Woodford," she said.

She says the union still has not heard from Attorney-General Jarrod Bleijie about its concerns for the welfare of staff at the Maryborough jail.

Ms Finley-Bisset says there has been overcrowding at the Maryborough jail for 18 months.

She wants the Government to consider moving inmates from the overcrowded Maryborough facility to Woodford.

The ABC has contacted Mr Bleijie for comment.