Anglian Water will start emergency investigations due to a collapsed sewer at the junction of the A158 and the B1202 in Wragby, on Friday 1 April.
To enable the works to be carried out safely, Victoria Street, Wragby will be closed and the traffic lights will need to be shut off and will only be working one phase at a time.
Temporary lights will be controlled manually during busy/peak periods including mornings and late afternoons on working days, and throughout the day over the weekend.
These arrangements will be kept under review, but the works are likely to lead to significant delays and long tailbacks during busy periods, and drivers are advised to seek alternative routes.
Notification signs for eastbound and westbound traffic will be in place well in advance of the works, near Lincoln and Horncastle.
Victoria Street in Wragby will be closed from Friday, April 1 while Anglian Water complete essential sewer repairs.
Since Anglian Water was alerted to the collapsed sewer, tankers have been used to bypass the section of sewer and ensure water recycling services are maintained for customers. They have also been carrying out investigations to find the exact location of the damage and how best to fix it.
A road closure and three-way traffic lights are now required to complete the repair and Anglian Water teams will be working weekends wherever possible to minimise disruption.
Sarah Dobson, from Anglian Water, said: “We are very sorry some customers may have experienced some disruption whilst tankers were used to maintain their water recycling services.
“Once the road closure is in place, we will be installing over-ground pipes to carry the used water away from the pipe so we can fully inspect and assess the damaged section of pipe. We will be able to provide a more detailed update on the progress of the works following the completion of our investigation.”
The over-ground pipe should be installed by Friday and the tankers will be removed from their current locations.
She added: “To allow the work to be completed as quickly and safely as possible, unfortunately Victoria Street will have to be closed.
“Traffic lights will be in place at the main junction with Market Place and manned during peak hours to help keep traffic moving.
“The sewer is deep with many other utilities and services to negotiate when you start digging underground. This makes the repairs complicated and sometimes time consuming, but we’re aiming to finish as soon as possible. Our teams will be working extended hours where possible.
“We know closing this road could be disruptive and we’re sorry for that. However, it’s important we repair this sewer to prevent any further damage to the pipe and to protect services for our customers.”
Advanced warning signs and diversions will be in place for the duration of the work. All businesses on the affected streets remain open as usual.