As floodwaters started to subside in the northern NSW town, some residents on the fringes of the flood started to return to their homes on Saturday to view the destruction.
NSW Premier Gladys Berejiklian, who will visit the region on Monday, urged residents to be patient as authorities surveyed the damage.
Queensland Fire and Emergency Services commissioner Katarina Carroll said 4000 assessments had been undertaken throughout northern parts of the state since Cyclone Debbie hit the coast.
'I said if my guitar was alright then I wouldn't complain about anything else, ' she said as her brother and friend drank beers and smoked cigarettes after returning to their home on Sunday.
Residents in northern NSW are beginning to return to their flooded homes.
A 46-year-old man also died at his Murwillumbah home, but it is understood he had not entered the floodwaters.
"This is a massive, massive natural disaster".
Forecasters expect a major flood peak to hit Rockhampton by the early hours of Thursday, reaching a level larger than the 2011 floods and potentially matching the February 1954 flood level of 9.4 metres.
It's still being established whether a man, whose body was found at a South Murwillumbah caravan park, died as a result of flooding.
"We are going to see other areas that may need to be evacuated in the next few days but nothing to the extent we've seen in Lismore", a State Emergency Services spokeswoman told AAP on Saturday.
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According to the SES, about 15,000 properties were isolated by floodwater, and about double that were subject to evacuation orders.
Two men wade across a flooded street, where a van is partially submerged, in Lismore.
They include Coraki, Woodburn, Cabbage Tree Island, and Wardell.
"We know it's very frustrating and people want to get back to their homes", she said on Sunday.
"There are a lot of health concerns around what may or may not be in the water". "We are the lucky ones".
In southeast Queensland, hundreds remain without power including suburbs such as Beenleigh, Eagleby and Loganlea - after Energex cut supply to stem the threat of electrocution.
The preparations come after the body of Eagleby man Nelson Raebel was found by emergency crews on Saturday afternoon, becoming the Queensland's first victim following ex-tropical Cyclone Debbie.
Logan mayor Luke Smith said the "unprecedented" impact of the weather meant a ballpark figure on the damage bill was beyond comprehension.
Roads around the town could be closed due to inundation of low-lying areas, Mr Morrow said.
At Minesh Solanki's discount store in Lismore, staff members were helping clean up items swept from shelves by the flood.