Begun in 1848 and completed in 1873, the breakwater starts at the southwest end with an extended and consolidated rocky headland of rubble fill with massive squared blocks to the outer revetments forming a wharf and incorporating a masonry landing stage. A narrower pier runs some 2.16km from this point to the lighthouse (NPRN 41259) at the northeast end of the breakwater, enclosing the New Harbour. A railway (nprn 422647) ran along the breakwater to bring stone from the quarries (nprn 310333) for construction and maintenance.
(Sources include CADW listing description)
J Hill 19/02/2004 & B.A.Malaws, RCAHMW, 06 April 2018.