Repairs to continue at the Chain Bridge
Recent repair work has revealed the bridge is in worse condition than expected, with sections of concrete needing to be replaced to ensure it remains safe to use.
Additionally, the water mains underneath the bridge needs upgrading.
As a result, the bridge is now expected to be closed until the end of September.
Andy Antcliff, senior bridge engineer, said: "The recent works have brought to light sections of concrete that need to be replaced to ensure safety issues don't develop in future.
"Unfortunately, this unforeseen development means we'll have to keep the bridge closed for longer than we originally intended.
"We realise this will be frustrating for motorists, but it's essential we get this work done.
"We encourage drivers to use the official signed diversion route to avoid congestion on roads in the area, and would like to remind people that local businesses will remain open and accessible during the works.
"We apologise for any inconvenience caused, and would like to thank people for their ongoing patience."
To allow the work to take place safely, this section of road will be closed for the duration of the project, with traffic diverted via the A52 Swineshead Road, B1192 Holmes Lane, B1391 Ralphs Lane, B1397 London Road and West End Road, and vice versa. Access will be maintained for pedestrians and cyclists.
The junction of West End Road with Chain Bridge Road and Old Hammond Beck Bank Road will remain open throughout, but will be controlled by three-way temporary traffic signals.
Vehicles will be unable to access the B&Q, Tesco, Downtown and Alban retail park from the east of the A52 roundabout, and customers will need to use the alternative route.
For the latest news on roadworks across the county, visit www.lincolnshire.gov.uk/roadworks .