Barmouth Viaduct

Grade II* listed Barmouth Viaduct crosses the estuary of the River Mawddach, south of the town, carrying a single track of the Cambrian Coast Railway. Its swing span over the navigation channel no longer opens but the viaduct remains in continual use. A walkway on one side allows pedestrian and cycle access. The Cambrian line, around the northern end of Cardigan Bay, connects Aberystwyth, Tywyn, Barmouth, Harlech, Porthmadog, Criccieth and Pwllheli.

Originally pedestrians and cyclists were charged a toll to cross the viaduct but the small charges became uneconomic to collect and were abolished in June 2013.