During a routine monitoring inspection of the Old Wye Bridge in Chepstow on Wednesday, October 1 2025, the council received a recommendation from the consulting bridge engineers to immediately close the bridge to traffic due to signs of structural damage.
Upon inspection, a crack was discovered in the structural beam on Pillar 2. Below, you can view images of the affected area along with a close-up of the identified crack.
We are currently discussing the next steps with the engineers, but the bridge will be closed for vehicular traffic until further notice.
The Old Wye Bridge, constructed from cast iron, was opened in July 1816. Monmouthshire County Council has continuously monitored the bridge with the assistance of expert engineers since 2018.
We will continue to provide updates to our residents through this page and on our social media platforms.
For further information, please read these Frequently Asked Questions.
How often have inspections taken place?
Inspections have been carried out on the bridge since the 1970s. The bridge is classified as a Sub-Standard Highways Structure and is managed in line with CS470 and CS454. The current monitoring regime is every six months.
Why was the cracking not detected before?
Previous inspections have picked up other cracking on the same pillar. The inspection on 1 October identified a new crack, raising concerns over the structural integrity of this part of the bridge. Previous inspections had highlighted that the structural beams were affected by both thermal fatigue and vehicular loading. The recent crack is likely linked to the expansion and contraction of the cast iron over the summer months.
Why can’t you weld the crack?
Repair options are being investigated. The structure is a Grade 1 Listed Structure, and all repairs must be carried out to retain the integrity of the listing. Welding cast iron is possible, but the crack is right through the beam, and in its current position, stresses will be displaced to another section.
How long will the bridge be closed?
We are not able to confirm timescales at this time. Further testing and modelling are needed to establish the extent of the required remedial works. As this is a Grade 1 Listed structure, any works will also need to be approved by CADW.
Is the weight limit on the M48 bridge putting extra traffic on local roads?
We do not have any evidence to suggest that the weight limit restrictions have created any additional traffic on local roads.
Are you going to pedestrianise the bridge?
The bridge is currently open to pedestrians whilst we undertake further investigations. It is our intention to reopen the bridge for vehicular traffic when it is safe to do so.