Treforest Tinplate Works Feeder Sluice and Weir

The Treforest Tinplate Works Feeder Sluice and Weir is a structure located on the west side of the weir. The sluice features a north wall made of coursed rubble stone, which once had two cast iron sluice gates on the upstream side. This wall now has concrete cappings, metal railings, and modern grilles at water level. On the opposite side of this wall, there is part of a cast iron lintel supported by two uprights, through which water once flowed.

On the east side, there is a wall of coursed rubble with rock-faced quoins and dressings. Inside a splayed recess, you can find the cast iron frame and lifting rack of a former sluice, which was located downstream from the weir and served to return water to the river. The walls of the fish pass, made of concrete blocks, are topped with metal railings and step down behind the original sluice walls. There are also modern sluice gates present.

Downstream, there is a rubble stone river wall that abuts the structure, although the original watercourse is no longer clearly defined. The masonry weir is curved to align with the current.