Mae'r morglawdd Fictoraidd 2.4km o hyd yn hanfodol er mwyn amddiffyn Porthladd Caergybi. Hebddo, byddai'r tonnau'n rhy wyllt i'r llongau fferi fedru hwylio, a gallai hynny arwain at golli'r gwasanaeth ac, yn y pen draw, at gau'r Porthladd. Mae'r morglawdd hefyd yn amddiffyn nifer o fusnesau ac adeiladau rhag llifogydd.
The 2.4km long Victorian breakwater provides essential protection to Holyhead Port. Without it, the wave conditions would be too severe for the operation of ferries and could result in the loss of service and ultimately the closure of the Port. The breakwater also protects several businesses and premises from flooding.