No 3 Dock, including bollards and capstans

No 3 Dock, including bollards and capstans, is a significant dry dock built around 1758, which was enlarged and covered in the mid-19th century and further enlarged and uncovered in the late 19th century.

Constructed from granite and limestone ashlar, the dock is oriented on a north-east to south-west axis, with its entrance facing west towards the Hamoaze estuary. The dock features altars that step down towards the center, with slides and steps around the sides to facilitate the movement of materials. The walls of the dock are rounded at the ends, and there are pedestrian steps leading down to the lower dock levels. The walls are adorned with two tiers of twenty segmental arches, which allowed cranes to operate closer to the ships. Additionally, the walls are marked at intervals with Roman numerals indicating the water height. The dock is flanked by late-19th century crane tracks.

Along the dock and basin, there are cast-iron bollards, most of which date from the late 19th century and are inscribed with the letters VR, with some bearing the date 1897. Upturned muzzle-loading cannons have also been repurposed as bollards. There are later capstans, including those made by Cowans Sheldon and Co, dated 1939.

Several features within the dock's footprint are not considered of special interest due to their later construction, plain design, and condition. These include metal barriers made from reused railway tracks, chain link fences, life ring stands, and metal security fencing, as well as fragments of early 20th-century dock rail track.