Walls of the Outer Basin and West Pier/Quay

The Outer Basin is a rectangular structure originally built with large, regularly coursed dressed limestone blocks, located to the south and west directly on outcropping rock. Over time, it has been supplemented with rock-faced stone and small stone patching and repairs. The southern and western walls are primarily made of these large coursed blocks, while the northern wall, which was added later, consists of rock-faced stone with clear infill where lockgates were removed after the Inner Basin was decommissioned. The eastern wall shows further alterations in its masonry.

The stone quaysides, which are partially covered with concrete or asphalt, feature iron and stone bollards and mooring rings. There are original steps at the northwest corner, consisting of two steps made from each stone block, along with what appears to be an original buttress nearby. The structure also includes culverts and a blocked arched opening in the western wall. The seawall to the east has blocks on its inner face that are decoratively snecked, while the seaward side is rock-faced, primarily made of large coursed blocks that are battered to the base, with a raised parapet.

The West Pier or Quay, located in front of Jennings Warehouse, is constructed from coursed dressed blocks, with the southern section made of rock-faced stone. There are grooves for gates, which seem to be submerged and visible in silt at low water.