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The annual condition survey of the Castle Cornet Bridge has started with visiting consultants checking it for any structural deterioration or damage.
The bridge’s reinforced concrete deck, which dates back to 1951, has required extensive monitoring and inspection in recent years because of the accelerated loss of concrete from the underside of the structure.
"Concrete specialists" McFarland Consulting are doing this work with an 'underbridge unit' to conduct "a detailed monitoring survey".
Access underneath the bridge is restricted - probably until Friday - and there is a cordon in place at beach level to stop people from crossing under the bridge due to the risk of spalling concrete.
The work will involve a visual inspection, hammer rap survey and strain sensor analysis on all spans of the main bridge, as well as the single span approach bridge to Castle Cornet.
"This (work) will assess the condition of the bridge and its suitability for ongoing pedestrian use until it can be replaced," said a spokesperson for Guernsey Ports.
Meanwhile, maritime bridge specialist JBA Consulting has been appointed to replace the 95-metre bridge with a like-for-like replacement, as approved by the States earlier this year.
This project will cost up to £7m.
Guernsey Ports Head of Infrastructure Delivery Jenny Giles said: “JBA has a proven track record in engineering and infrastructure projects across the UK, including the recent reconstruction of the Dighty Burn Bridge in Dundee.
“They will provide technical expertise and knowledge in this highly-specialised area to help optimise the design and building of a new bridge. This will help us to achieve best value design and delivery of a multi-million pound investment in our infrastructure that will last for more than half a century.
“JBA will advise on the outline design of the new bridge, the submission of a planning application and the development of the tender specification. Their contacts and experience of previous maritime bridge projects will help us to reach a wide audience, and they will act as technical adviser on reviewing the submitted designs.”
Guernsey Ports is expected to go out to tender for a design and build contract by April with a view to appointing a contractor by the end of 2025.
Subject to contractor schedules and build preferences, the full replacement of the Castle Bridge remains on track for completion by the end of 2026 said Guernsey Ports.
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