National Highways said 'complex' work on the M32 Eastville Viaduct is due to start in 2026.
Safety inspectors carried out a general inspection report in June and found significant defects.
Drainage systems are blocked and causing "extensive water staining and corrosion", with water high in chloride, from road salts, going into the structure and leaking onto the pavement below. Underneath the bridge, several large areas of spalling, when concrete starts cracking and exposing reinforced steel, can be seen.Since the report was published, National Highways has been working with consultants to develop design plans, which are in the process of being handed over to the agency's major projects team.Sean Walsh, route manager for National Highways, said: "This structure, as with anything, has a design life.
"It's a bridge designed for about 120 years and it's about 50 years old now, so we're at the point where we have to start replacing some elements of it.National Highways said it was hopeful there will be minimal disruption for motorists during the repair works. The M32 will remain open in both directions, although individual slip roads at Eastville will close for extended periods and there will be occasional overnight closures of the motorway.
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