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Barmouth Bridge, also known as Barmouth Viaduct, is a single track largely wooden railway viaduct that carries the Cambrian Coast Railway across the Mawddach estuary.
The bridge opened in 1867, and originally included a drawbridge section at its north end for tall ships to pass, though this was later replaced by the current swing bridge section. In 1980, a marine worm threatened the safety of the bridge, which needed major repairs to avoid closure. A footbridge is incorporated on the eastern side of the track. Tolls were collected for foot and cycle traffic until 2013.
The bridge is a Grade II listed structure, and has one of the longest timber viaducts still in regular use in Britain containing 113 wooded trestles supported by a series of cast iron piers. The swing bridge section was last swung in 1987 during routine testing and has since been out of use and doubtful if it will never open again as rails across the bridge are now continuous across the span joints.