Hagan's Bridge, Rocks Chapel Road, Lisnamore, Crossgar, Co Down

This is a single-span road bridge, dating from approximately 1856, designed by Sir John MacNeill and built to carry the Rocks Chapel Road over a section of the Belfast & County Down Railway line between Crossgar and Downpatrick. The railway line closed in 1950.

The bridge is situated on the Rocks Chapel Road, approximately one mile south of Crossgar. It features a single elliptical arch constructed of coursed, rock-faced fieldstone, with dressed sandstone voussoirs forming the arch itself. A string course runs at arch springing level and continues underneath the bridge. The northern face is partially obscured by plant growth, while the southern face is completely concealed. The south end of the arch has been largely blocked with breeze blocks, and the underside of the bridge is now informally used as a cattle shed. The road surface on the bridge is tarmacked. The bridge has coping along its parapets, though the southern parapet is heavily overgrown with plants.

The bridge was constructed around 1856 to accommodate the Rocks Chapel Road as the Belfast & County Down Railway was built between Crossgar and Downpatrick. Sir John MacNeill, the BCDR's chief engineer, designed the bridge, and Patrick Moore, his principal contractor, built it. The structure has industrial archaeological interest.