About 160 people took refuge in the Princess Royal Sports Arena as flood waters breached Boston’s defences.
The centre was manned by the British Road Cross.
Organiser Edith Wesley said: “It started really quite slowly and we thought nothing was going to happen. Then at about 6pm all hell broke lose. We had people coming in soaking wet and some were distraught.”
People were being ferried to Caythorpe College and William of Gloucester Barracks at Grantham throughout the evening.
It was then announced by a police officer that the PRSA was to close as an evacuation centre, as although it was in no immediate risk, the sports venue itself was in a designated flood risk area. Everyone was then taken by coach to Grantham.
“The team coped remarkably well,” said Ms Wesley. “It is what we are trained to do.”
As The Standard left some people were still turning up at the arena, including one woman who was soaked to the waist from flood water.