Work to strengthen Ditchford Bridge near Rushden will start on Monday, November 4, with a road closure put in place.
A temporary weight restriction was put in place from March this year to protect the historic bridge which is a scheduled ancient monument.
The bridge was also damaged following a road traffic accident. A full closure is needed for work to take place safely on the structure.
These works were due to start sooner but were delayed to ensure they were not clashing with the works on the Highways England road, the A45, which are being carried out by Network Rail for the electrification of the rail line.
By starting on November 4 it will allow all works to be completed before any other works start in the area, including the improvements works on the A45 at Chowns Mill by Highways England.
Cllr Jason Smithers, Northamptonshire County Council Cabinet member for highways and place, said: “I’m delighted that we’re now in a position to start these very important works on this bridge which a scheduled ancient monument.
“We’ve worked closely with our partner organisations to ensure that disruption to the travelling public has been kept to a minimum.”
A contraflow system has been in place on the nearby A45 since the start of 2019 so a bridge could be re-built. The contraflow was removed on the night of Tuesday, October 8 and lane closures have been in place since. The entry slip onto the A45 at Rushden A5001, Northampton Rd has also remained closed.
There will be some full night closures for the completion of the A45 bridge works and parapet works until November 3.
- Westbound full closures – October 28 to November 1
- Eastbound full closure – November 1, 2 and 3
Any further work will be carried out under current lane restrictions but there will be access for traffic both east and west.