Emergency services are in the process of evacuating more than 1,000 people from Billing Aquadrome as the waters in the area continue to rise following yesterday's heavy rain.
A spokesperson for Northamptonshire Police said the residents were being moved from 500 caravans at the holiday park.
"Preparations are under way to move the occupants as the night closes in, with freezing temperatures expected in the early hours. Some residents have presented with hypothermia. Emergency accommodation is being sourced in at least two leisure centres in Northampton," the spokesperson said.
Chief Supt Mick Stamper, of Northamptonshire Police, said: “Residents are urged to leave the site immediately and seek accommodation with family or friends where possible. Anyone worried that this may be put them in breach of Covid-19 regulations should be assured these are exceptional circumstances and they will be exempt. We would, however, urge people not to go to homes where people are shielding or self-isolating as a result of Covid.
"This is an exceptionally challenging situation and emergency services, working with partners and volunteers are working flat out to resolve the situation and safeguard those affected on site.”
Temperatures are dropping and waters are set to continue to rise for four to five to hours, the spokesperson added.
Northants Search and Rescue has been posting pictures of their continuing efforts to support residents.