Ballydonaghy Bridge, Garlandstown Road, Glenavy, Crumlin, Co Antrim, BT 29

This is a well-built, three-arch bridge dating from approximately 1780 to 1799, carrying the Garlandstown Road over the Glenavy River. Constructed of random rubble stone, the bridge demonstrates late 18th-century engineering principles. It features a gentle curve to the deck and high-angled cutwaters at each end, rising to the level of the parapets. The segmental arches, with their split stone rubble voussoirs, are slightly inset from the parapets and approach walls, a characteristic detail found in other nearby bridges. The left-bank (south) arch is dry and currently serves as a cattle run between fields. The middle arch is wider and higher than the end arches, contributing to the deck’s slight curvature. The parapets are coped with roughly dressed stone blocks, although some coping stones at the southwest end have been dislodged. The bridge carries a two-lane road, and a buried pipe runs between the road and the downstream parapet. The bridge appears on the 1832 Ordnance Survey six-inch map under the name "Ballydonaghy Bridge," and subsequent editions. Its rural setting remains largely unspoiled, and it has group value with Knockcairn Bridge (HB19/02/005), located nearby and crossing the same river. The bridge is noted for its industrial archaeological interest and has significance due to its age, authenticity, local interest, and structural system.