Killinchy Bridge, Comber Road, Ballyministragh/Balloo, Killinchy, Co Down

A substantial viaduct, likely dating from the early 19th century (circa 1820-1839), is constructed from snecked bluestone rubble with sandstone dressings. The bridge spans the River Blackwater and a former mill race across a valley on the Comber Road, just north of the hamlet of Balloo. It is situated on the boundary of the townlands of Ballministragh and Balloo.

Originally a high road viaduct, the bridge features tall arches which are now blocked, with small openings visible over the river and the former mill race. The arches appear to number at least four, although more may be present, and are defined by sandstone quoins, voussoirs and a sandstone springing course. The blocked arches are filled with random rubble, including a low segmental arch where the mill race once ran. A similar, slightly larger opening is visible in the blocked arch above the river. Buttress-like piers are positioned between the main arches, and the parapet between these piers is now rendered in cement with rounded coping. Significant portions of the bridge are concealed by climbing plants and greenery.

The bridge is depicted on Ordnance Survey maps from 1834 and 1859-60, identified as ‘Killinchy Bridge’, suggesting the arches were originally open. The viaduct is considered to be of industrial archaeological interest.