Cymmer Viaduct

A wrought-iron lattice-girder viaduct aligned roughly N-S and with a slightly curved deck. The main abutments are of coursed rock-faced stone, and comprise a round arch with keystone, above which is a string course and coped parapet. The arches are flanked by round turrets that are carried up the full height of the parapets. On the N side the parapets curve outwards and terminate in square piers. On the S side is a further abutment that carried a second girder bridge over the adjacent former Rhondda and Swansea Bay Railway (now the Afan Valley Cycle Way).

The lattice girders are carried on 3 tapering rectangular piers of rock-face stone and moulded copings. The girders are constructed in 4 straight sections and retain some timber cross members on the deck.