Kate McKay's Bridge, Ardbrin Road, Katesbridge, Banbridge, Co Down, BT32

Kate McKay's Bridge is an early 18th century five-arch masonry road bridge spanning the River Lagan at the south end of Katesbridge village in County Down. The bridge dates to around 1700, first recorded as a "New Bridge" on Moll's 1714 map, then cited by Harris in 1743 as "Makey's Bridge", and subsequently identified as Kate McKay's Bridge on the 1833 Ordnance Survey map and later editions.

The bridge is constructed throughout of random granite and Silurian rubble masonry. It comprises five semicircular arches that increase progressively in both height and width towards the centre. In normal river conditions, only the middle three arches carry water flow. The arches feature gunited soffits and voussoirs, and a steel plate and tie rod runs through each side of the arch crowns as reinforcement. The abutments and piers have been underpinned with concrete, and angled cutwaters at both ends of all piers rise to arch spring level, with tapered caps continuing to road level. The spandrels and parapets are heavily pointed, and the parapets are coped with flat, roughly-dressed granite blocks.

The deck is slightly curved and comprises two lanes. A rubble masonry flood arch is visible on the upstream face towards the south end of the bridge, though its downstream face is buried. No corresponding flood arch is now visible at the north end.

According to the 1837 Ordnance Survey Memoir, the bridge measured 210 feet in total length and 16 feet 6 inches in breadth, with the river at the bridge being 125 feet wide. The memoir described it as "a plain structure of unhewn stone, consisting of five large arches and a small flood arch on each side of the larger ones". The absence of evidence for rebuilding or widening suggests the bridge is substantially the original structure of circa 1700 date.

The bridge is significant both as a crossing point on the Lagan and as the structure from which the village takes its name. It represents an important example of early 18th century bridge construction and the development of infrastructure in the district, surviving in its historic rural setting south of Katesbridge village.