Police continue to search the swollen Brisbane River for the elderly man, who fell from a boat near Breakfast Creek on Saturday.
Nine people have already died in floods triggered by relentless rain that has pummelled some parts of the region for up to a week.
South of Brisbane, major flooding was occurring on Wednesday in Waterford, Loganholme and Beenleigh where the Logan River has inundated about 150 homes after rising higher than it did in 2017, when ex-tropical cyclone Debbie lashed the region.
In Brisbane, the river has dropped to a minor to moderate flood level for the first time in two days.
More than 19,000 homes and businesses in Brisbane, Gympie, Ipswich and Logan have been damaged along with roads, bridges and other infrastructure by the widespread floods.
Premier Annastacia Palaszczuk says the cleanup and repair bill could run "into the millions if not hitting the billion mark".
"I'm sick of these bad times. We've had two years of the pandemic, now we've had floods across the entire southeast and up to Fraser Coast and I think we need a really good Easter," she told the Nine Network on Wednesday.
Ms Palaszczuk has been talking with the 1150 people in evacuation centres, many of whom had lost their homes but were relieved to have survived.
She promised the government would help people get back on their feet once the water had fully receded.
"There are so many people that are really going through the toughest of times," the premier said.
There has been some criticism of the government for not pre-emptively releasing water from the Wivenhoe Dam before the intense rain set in.
However, Ms Palaszczuk said that not even the Bureau of Meteorology had predicted that Wivenhoe would be filled with the equivalent of "four Sydney Harbours" in two to three days.
She also said none of the dam releases thus far have pushed the Brisbane River level any higher than the peak it reached from existing flooding.
"Now, Mary River flooded, Gympie and Maryborough, and they had very high flooding - nothing to do with Wivenhoe," she told Network Ten.
"Down in northern NSW, they had the worst floods ever, nothing to do with Wivenhoe.
"Wivenhoe did its job, it held back four Sydney Harbours, and what we are seeing now is controlled releases. What do those controlled releases mean, the controlled releases mean that this will not make the flood level go higher, but what it will do is it will actually prolong the time of the flood."
Meanwhile, the BoM has warned of possible severe thunderstorms with intense rain in parts of the region from Wednesday afternoon.
"So very much the message to those people in southeast Queensland - the danger isn't over just yet," the BOM's Jonathon How said.
Commonwealth and state disaster payments of up to $180 per person and up to $900 for a family of five are also on offer for southeast Queensland residents hit by the floods.
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