Bridge no.8, to north of, Tiroony Road, Carrickmore, Omagh, BT79 9HB

A double-span bridge built around 1850, carrying a now disused railway line over the Altanagh River. The bridge is constructed in squared-and-snecked rockfaced sandstone with dressed stonework details throughout. It features squared-and-snecked rockfaced sandstone piers, spandrels and abutments, with a V-shaped cutwater to the central pier and flat rockfaced coping to the parapet. Two segmental-headed arches have dressed rockfaced voussoirs, while the soffit is cement applied over squared-and-snecked stone. The carriageway is approximately 3 metres wide. All stonework detailing and dressings are retained and the structure remains unaltered from its original construction.

The bridge first appears on the second edition Ordnance Survey map of 1853, by which time the railway had been added to a revision of the map. The railway was captioned "Portadown, Dungannon and Omagh Railway". By the third edition of 1906 it was captioned "GNR (Portadown and Londonderry Branch)" and by the fourth edition "GNR (Ireland)". The Portadown, Dungannon and Omagh Junction Railway Company was incorporated by Royal Assent in August 1857, and the 27 miles of single-track line from Dungannon to Omagh were constructed with £100,000 of share capital and £33,000 of loans. The line was built across the windswept moorlands of the south Sperrins, passing through Pomeroy and Carrickmore to Sixmilecross, Beragh and Omagh, where a junction was made with the Londonderry and Enniskillen Railway on 2 September 1861. Upon completion, the 41 miles of single-track from Portadown to Omagh were leased to the Ulster Railway Company for 999 years. The line was taken over by the Ulster Railway Company on 1 January 1876 and subsequently merged with the Northern Railway Company on 1 April 1876 to form The Great Northern Railway Company (Ireland).

The bridge is located in rural agricultural land with overgrown embankments to east and west.