Bridge no.6, Tiroony Road, Carrickmore, Omagh, BT79 9HB

A single-span road bridge built around 1850, carrying Tiroony Road over a now-disused railway line. The bridge is constructed of squared-and-snecked rockfaced sandstone with splayed abutments, spandrels and parapet finished with flat rockfaced coping. A single elliptical-headed arch features dressed rockfaced voussoirs with a squared-and-snecked soffit. The carriageway is approximately 4 metres wide. To the north and south, perpendicular retaining walls terminate in square pillars. The road is bounded on each side by hedging set into the embankment. The stonework detailing and dressings have survived, 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 the map. The railway was initially captioned the Portadown, Dungannon and Omagh Railway. By the third edition of 1906 it was captioned as the GNR (Portadown and Londonderry Branch), and by the fourth edition as GNR (Ireland).

The railway was authorised in August 1857 when Royal Assent was granted to the bill incorporating the Portadown, Dungannon and Omagh Junction Railway Company. The 27 miles of single-track line from Dungannon to Omagh were constructed with £100,000 of share capital and £33,000 of loans. Substantial engineering works were required, including a single-track tunnel almost half a mile in length through Windmill Hill. Within three years the line had been extended across the moorlands of the south Sperrrins by Pomeroy and Carrickmore to Sixmilecross, Beragh and Omagh, where a junction was made with the Londonderry and Enniskillen Railway on 2 September 1861. The completed 41 miles of single-track way 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).

With the removal of the railway, the bridge's significance is considerably reduced, and better examples of similar structures are listed elsewhere.