Scores of homes have been evacuated in Aberdeenshire after the River Don burst its banks and the River Ythan threatened to overflow, while people in an area of Aberdeen were advised to leave their properties.
Roads have been closed and trains and flights cancelled in Aberdeen and across the surrounding region as water levels reached record highs.
Abergeldie Castle is under threat of collapsing into the River Dee in Scotland.
The council is working with the owners and insurers to try to save the Aberdeenshire Castle which neighbours the Queen's residence of Balmoral.
Video report by ITV News presenter Tom Bradby.
Though to have been built around 1550, the castle is now under threat after Storm Frank battered Scotland.
Scores of homes have been evacuated in Aberdeenshire, with severe flood warnings still in place for Inverurie and Kintore.
Scores of homes have been evacuated in Aberdeenshire after the River Don rose to record levels and burst its banks.
The fierce storms and torrential downpours in the last month of 2015 contributed to the wettest month in the UK since records began.