The A1175 and King Street at West Deeping are closed after a water main burst.
The problem was reported just before midday. Anglian Water engineers and fire crew are at the scene trying to fix the leak and divert water away from the road.
Both the A1175 towards Market Deeping and King Street are closed to traffic around the West Street crossroads while the main is repaired. A police spokesman said the roads were likely to remain closed for some time.
Emma Staples from Anglian Water said: “We’re sorry that a burst to a large water main at around midday today has meant the crossroads of the A1175 and King Street, near West Deeping, has been closed.
“We immediately sent a large team of engineers to site who have been working hard to return things to normal as quickly as possible. Unfortunately, some customers in Tallington were without water for a short time earlier, but supplies should now be returning to normal.
“Our team will be working to fully repair the water pipe and the road, and return things to normal as soon as they can. Once again we are very sorry for any inconvenience caused and would like to thank customers and road users for their understanding today.
“Sometimes after a burst when your water supply returns it may appear cloudy or discoloured. This is normal, just run the tap for a few minutes until it runs clear.”