The £30 million restoration project has been planned to avoid the busy summer months and that's helped cement Barmouth's position as southern Snowdonia's most popular seaside spot.
Passengers, visitors and the local community are being reminded that, with the peak Summer season over, the viaduct will be completely closed, including the walkway, from Sunday 12 September to Sunday 12 December 2021, to allow the work to be carried out safely.
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Network Rail is replacing more than 1,000 timber and metal elements of the viaduct as part of a £30m restoration.
Bill Kelly, Network Rail's Route Director for Wales and Borders, said: "I'm delighted that so many visitors have returned to Barmouth this year to enjoy everything the town has to offer.
"We have carefully planned our £30m restoration of Barmouth Viaduct so that most of our work takes place outside the peak summer season, but also avoiding the worst of the winter months when bad weather would make the work too challenging.
"The upgrade will allow us to continue to run a safe, reliable and efficient railway, and secure the future of Barmouth Bridge for years to come."
Transport for Wales will be providing rail replacement services during the closure and passengers are advised to check before travelling.
During 2022, Network Rail will replace the metallic spans of the viaduct and the associated track. They will also be upgrading the track at the north and south end of the viaduct in 2022.
