Cassy Water Bridge, Near 381 Killowen Road, Killowen, rostrevor, Newry, Co Down, BT34 4SF

This twin-arch granite bridge carries the main Kilkeel – Rostrevor road over the Cassy Water. The arches are equal in size and skewed. Only the west one is in normal use. Both are embellished with rusticated voussoirs. The squared rubble soffit stones are set on the skew, not orthogonally. The abutments and pier are of regularly coursed roughly dressed granite blocks. There is a rounded cutwater on each side, rising to a shallow dome at arch spring level. The spandrels and parapets are of squared rubble; the latter are coped with large blocks. The approach walls on either side are of random rubble. There is a slight hump on the road and a footpath runs along the downstream side. The total width of the bridge is 8.9m (including 0.45m thick parapets); there is no evidence of any widening. The bed of the river is paved with granite and makes four shallow steps immediately downstream of the bridge. The three upper steps are of cement-rendered rubble, but the bottom one survives as large squared blocks. This arrangement was designed to minimise scouring (and thus undercutting of the foundations) and slow up flood water passing through the arches.