Preparation work for repairs to Cawood swing bridge begins on Monday 8 October.
The road will remain open, but the bridge, between Naburn and Selby, will be unable to swing for river traffic from Monday until the project is completed.
Initially, there will be work underneath the bridge removing jacks and propping and also checking electrical cabling and installing access scaffolding. The road will then be closed on 22 October for four weeks with a diversion in place, but full pedestrian and cyclist access will be maintained.
The swing bridge is to undergo a major refurbishment of the mechanical equipment that runs the movement of the bridge, including the hydraulic, electrical and control systems. Some components of the bridge have come to the end of their working life and are obsolete, so North Yorkshire County Council is carrying out a £500,000 upgrade to avoid a major breakdown. The last major upgrade was 36 years ago.
Councillor Don Mackenzie, executive member for highways, said: “The hydraulic bridge motor and the bridge operating software have come to the end of their working life and the upgrade work will bring the bridge up to date with modern equipment, parts and technology.’’
Councillor Andrew Lee, who represents Cawood and Saxton, said: “The council has been working closely with the contractors and engineers to make sure it is programmed to have the least impact to vehicles and the shortest closure achievable. We would like to thank people in advance for their understanding and patience while this essential scheme is carried out.”