Cwm Clydach Dam (partly in Dyffryn Clydach community)

Cwm Clydach Dam is a structure made of Pennant sandstone, featuring a high wall with a battered lower face. The western end of the dam has buttresses situated between two outlets that lead from vertical cast-iron tubes, one of which has cast-iron paddle gearing on the north side. Above these outlets, there are four overflow outlets, each supported by cast-iron stop-plank supports. The dam also serves as a minor roadway, which is bordered on the east by rubble stone walls, 20th-century railings, and additional rubble stone walls, leading to concreted walls at the western end. The reservoir behind the dam is heavily silted, nearly reaching road level.