North Quay walls, steps, former stables and sluice and adjacent road bridge

The North Quay walls, steps, former stables, sluice, and adjacent road bridge date to the mid-18th century, with extensions and alterations in the 19th and late 20th centuries. A sluice and attached road bridge were constructed in the early 19th century, and a former stables building is from the 19th century.

The quay walls are constructed of granite interspersed with Killas rubble stone and copper slag blocks with granite copings and dressings, held together with iron cramps. The north return wall is of granite sleeper blocks, and there are iron mooring posts and rings along the quayside. The sluice and bridge are built of scoria and local stone, with 19th-century coursed stone additions.

The quay walls extend approximately 470 metres from west to east, with a return to the north at the west end. Set back from the quay walls to the east is a late-19th century building, likely a former stables. The quay walls are slightly battered with granite coping, and show localised areas of rebuilding and repair from the 19th to 21st centuries. The copings were restored in the early 21st century. A flight of granite steps leads to a return in the central section of the quay wall.

The former stables are rectangular on plan and roofless, with four openings facing the quayside. In front of the stables is a section of brick paving and preserved railway tracks within the modern surfacing.

The former sluice at the east end of the quay is attached to the early 19th century road bridge, which traverses the stream once controlled by the sluice, serving the Copperhouse Pool and Canal. The bridge has a coursed rubble stone west portal with a scoria arch. The east portal is almost infilled by landscaping, although a rubble stone pier is visible above the modern surfacing, with a narrow gap marked by 21st-century railings. To the west of the bridge is a coursed stone wall with a small opening at its foot under a flat lintel, spanning the channel to the sluice between the splayed scoria walls to each side (North Quay and Custom House Quay). Modern railings are fixed to the top of this wall and are not of special interest. The sluice channel is lined by rubble stone and scoria walls.