Hownes Gill Viaduct

Hownes Gill Viaduct is a railway viaduct, built in 1858 by Thomas Bouch for the Stockton and Darlington Railway. It is now part of Waskerley Walk. The structure is made of yellow brick with sandstone ashlar dressings and features cast iron railings. The viaduct has 12 semi-circular arches, each 50 feet in diameter and reaching a height of 150 feet at their highest point. These arches are supported by tapered piers, which have three-stage buttresses on the full-height piers, while the others display similar detailing.

The central tallest piers are capped with wide ashlar coping on three sides of the buttress plinths, and each stage of the piers has continuous ashlar coping with bands. The inner faces of the piers have blind brick arches at each stage, with the lowest stage featuring inverted bottom arches. The nosed coping supports a railing made of intersecting arcades, linked by rings and topped with low block finials. There are outer stays, and a short section has been renewed at the south end. Notably, the fifth pier from the south has a red brick X pattern on its north face, with a corresponding rough X incised on the top coping, though its purpose is unknown. The rectangular piers at the ends of the parapet have a band that runs continuously with the coping.