Barmouth Viaduct
... that by 1980, the structure of the Barmouth Viaduct had come under attack from marine woodworm, which threatened its closure?
... that by 1980, the structure of the <b id="mwBrE"><a href="./Barmouth_Bridge" id="mwBrI" rel="mw:WikiLink" title="Barmouth Bridge">Barmouth Viaduct</a></b> had come under attack from <a href="./Teredo_navalis" id="mwBrM" rel="mw:WikiLink" title="Teredo navalis">marine woodworm</a>, which threatened its closure?