The Iron Bridge at Draethen is a three-arch accommodation bridge across the River Rhymney. The cast-iron structure is dated 1829, and the wrought iron railings were almost certainly manufactured in Rhymney Ironworks. The bridge was erected as part of a carriage drive between Ruperra Castle and Machen church, probably coinciding with the appointment of Augustus Morgan, son of Sir Charles Morgan, to the living of Machen circa 1828. The drive is now a public footpath.
Sources: A Guide to the Industrial Archaeology of South East Wales, AIA, 2003; Cadw listed buildings number 21438
Claire Parry, RCAHMW, 22 June 2011.