Weel Bridge in Grovehill road, Beverley, is to close for three weeks to allow repairs to be carried out.
East Riding of Yorkshire Council has announced that work is planned to start on September 10 and will continue until September 30.
The main structure of the bridge is made of aluminium and a recent inspection found some corrosion where it meets the steel counterweight.
To carry out the work, the bridge will be raised to the lifted position while a section is replaced. The road will be closed and diversions will be in place.
The road is a main route to the council’s household waste recylcing site and residents are being advised to go through Tickton and down Weel Road to avoid the closure on Grovehill Road.
A council spokesman said the works would be carried out as quickly as possible to minimise disruption. The bridge is about 60 years old and it is the first time it has needed this level of repair.