Arten Gill Viaduct is constructed partly from Dent Marble in the inside of the arches instead of the more usual brick.

[8][9] Most of the Dent Marble used in the viaduct was sourced from a quarry directly underneath the bridge in Artengill,[note 1] and at least 50,000 tonnes (55,000 tons) of dressed stone was used in its construction.

[14] Due to the loose soil and rock on the valley floor, some of the viaduct piers were rooted to a depth of 55 feet (17 m).

2 (Dent Head to Smardale Viaduct, a total of 17 miles (27 km)), and Arten Gill is listed as bridge number 84.

[18] As indicated by the name of the viaduct, it crosses a steep valley through which the small watercourse of Artengill passes, but also an old pack-horse route eastwards across the moors.

[21] The route between Blea Moor Tunnel and Garsdale traverses the western edge of Great Knoutberry Hill and so needed several cuttings.