The majority of the length of the scheme is protected from the sea by either Welsh Government defences, Conwy County Borough Council defences or Network Rail defences.
Caiff y rhan fwyaf o hyd y cynllun ei amddiffyn rhag y môr gan amddiffynfeydd Llywodraeth Cymru, amddiffynfeydd Cyngor Bwrdeistref Sirol Conwy neu amddiffynfeydd Network Rail.