Ballinderry River Bridge, Clontarriff Rd, Ballinderry Upper, Lisburn, Co Antrim, BT28

This is a small, early nineteenth-century stone bridge of three arches, spanning the Ballinderry River just south of the main Ballinderry-Lisburn road. Constructed of random rubble masonry, with squared random rubble abutments, the bridge carries a minor single-lane road. The arches are of a segmental profile with roughly dressed voussoirs; the central arch is wider and higher than the side arches, creating a slightly humped deck. Angled cutwaters are present on the eastern (upstream) and western (downstream) elevations, rising to arch spring level. The soffits have been gunited, and the parapets are coped with fieldstones set at regular intervals in cement mortar. Although the road’s route is depicted on an 1832 Ordnance Survey map, the bridge itself does not appear until the 1857 edition, suggesting construction likely occurred in the 1830s following the road's formation. While alterations, including the cementing of the parapets and guniting of the soffits, affect its overall authenticity, it possesses some interest as an example of industrial archaeology.