A water main has burst on the southbound lane of the A153 East Road near Sleaford.
Anglian Water contractors are currently at the scene setting up temporary lights to control traffic, close to the rugby club and A17 slip road.
These signals will be manually controlled during rush hour to minimise disruption as far as possible.
Contractors are working to identify the exact location of the leak so they can make the necessary repairs.
At this time, they have not been able to provide an estimated timescale for the works.