Emergency services have began rescuing people from homes in Wainfleet as floods continue to cause damage to properties.
Around 70 homes in Wainfleet are thought to have been swamped in the deluge after the River Steeping burst its banks on Thursday.
Up to 50 firefighters and several police officers have been called to the scene as part of efforts to reduce the flow of water from the river.
The RAF has also sent in a Chinook helicopter to drop sand in an attempt to fill the breach stop the river from flooding any further.
But there are fears a further 720 homes could be at risk.
Homes believed to be most at risk are those on Matt Pitts Lane, Brewster Lane and Hastings Drive.
Residents in those areas have already been asked to leave their homes, with many of them going to the Embassy Centre in Skegness or Coronation Hall and others being taken in by relatives.