Scottish homes were evacuated on Thursday evening after the River Don burst its banks due to heavy rain.
Police Scotland had advised people living in parts of Aberdeenshire on the banks of the Don to leave their homes as water levels reached record highs and threatened to pour into the city.
Around 38 properties were evacuated in Port Elphinstone, near Inverurie, and 18 in Ellon, the BBC reported.
Two severe flood warnings, meaning a danger to life, were issued for Kintore and Inverurie by the Scottish Environment Protection Agency (Sepa).
The Met Office has also issued amber and yellow warnings for rain and snow covering many parts of Scotland.
Aberdeenshire Council said it had a "very challenging night" as "dozens" of homes were flooded following heavy rainfall.
Residents in their 80s were among those forced to leave their homes due to Thursday night's heavy rain.
Elderly people were escorted to ambulances to keep warm while they waited for rescue boats, the BBC reported.
Ewan Murray from the Scottish Ambulance Service told BBC Scotland on Thursday that it was a complicated rescue operation.
"We are trying to get everyone out and up to Inverurie Academy," he said.
"There are torrents of water running down the streets and we are waiting on the fire service water rescue team to come and assist us.
"They will get boats to the people who are less mobile. They will be taken out by boat into ambulances and then taken to one of the local hospitals or to Inverurie Academy."
Travel across eastern Scotland was also disrupted after the River Don burst its banks.
Train services between Aberdeen and Inverness are severely affected due to flooding at Inverurie. The rail line between Aberdeen and Dundee has been closed due to flooding.
There are several road closures, including 24 in Aberdeenshire, and 13 in Tayside. Engineers are also at the scene following power cuts in some of areas caused by the heavy rain.
Twenty people spent the night in terminal building at Aberdeen International Airport. With some flights diverted while an assessment took place over runway repair, as the tarmac was said to have been damaged due to heavy rain, the Guardian reported.
The airport hoped to resume normal service on Friday, however advised passengers to check with individual airlines before travelling.
Power cuts, freezing temperatures, and snow hindered rescue efforts, and an emergency rest centre could not be used due to flood water.
In a statement on Thursday, chief superintendent Campbell Thomson for Police Scotland, said: "A major incident was declared due to the severity of the warnings in place and the potential for serious impact on communities.
"A number of roads throughout the region remain closed and I want to remind the public of the need to travel with extreme caution. With freezing temperatures expected, conditions will be hazardous and you should only travel if essential."