Work is expected to start on replacing the damaged Bedford Bridge at Quadring Eaudyke.
The northern side of the bridge partially collapsed in late 2019 and was temporarily repaired.
A full replacement is scheduled to be installed with a wider bridge and concrete parapets.
Work is due to start on Monday, October 4 and is expected to last nine weeks. Water Gate will be closed between Sarah Gate and Wood Lane and there will be a diversion in place through Quadring and Gosberton.
Access to properties will be maintained, but there will be no route over the drain during the works.