Disaster authorities in Queensland's Wide Bay are trying to get essential food supplies into the region as stocks are running low.

The Bruce Highway is closed south of Gympie and authorities say it could remain so until Friday.

It is delaying the delivery of food into the region and fuelling panic-buying.

There has been reports of essential food like bread and milk running low in Bundaberg, Hervey Bay and Gympie.

Bundaberg Mayor Lorraine Pyefinch says authorities are trying to work out the best way of getting food to the Wide Bay-Burnett region, but residents need to remain calm.

"The stores do have supplies there but we don't want to stretch them too far," she said.

Councillor Pyefinch says fuel supplies will be replenished from Gladstone.

Theodore all-clear

Meanwhile, the residents of Theodore, west of Bundaberg, have been given the all-clear to return to their flood ravaged homes.

Around 350 residents were evacuated to Moura when floodwaters inundated the central Queensland town last month.

Residents have been cleaning up over the past few days but have been unable to stay overnight because there was no water supply.

Banana Shire Mayor John Hooper says there is accommodation organised for people who cannot stay in their homes.

"Town water supply is now available for washing clothes, showering and cleaning purposes [but] can't use it though for drinking, brushing teeth," he said.

"They should probably use bottled water or boiled water.

"If they can't stay in their house there's mattresses on the floor at the hotel.

"People can stay in Moura until Saturday but Saturday is definitely the deadline."

Maryborough threat

In Maryborough, Ergon Energy has started disconnecting power in some homes the town south of Bundaberg, as the flood threat increases.

Ergon Energy spokesman Rod Rehbein says up to 20 properties could potentially be disconnected when the peak hits.

"We've disconnected a further two residents in the Wharf Street area as floodwaters have risen there and we'll continue to monitor that," he said.

"There is the likelihood of a small number of further disconnections being required during the day."

A telephone hotline - 1300 993 191 - has been set up for people seeking information on friends and relatives caught up in the flooding disaster.