Tunnel, Port Dinorwic, (W portal). SH 5329 6826.
West tunnel mouth recently walled-up and tipped over; only top part of arch is visible. East portal blocked by earlier tipping and is covered by garden of house on opposite side of main road.
Site visited B.A.Malaws, 15 January 1992.
(Source: taken from the site notes of B.M.Malaws)
J Hill 29.10.2003