Conisbrough Viaduct

This railway viaduct was built between 1906 and 1909. It spans the River Don Valley, approximately 1.08km north-east of Conisbrough Castle, situated between Foulsyke Wood and Nearcliff Wood. The viaduct is 482.8m (528yds) long and has a double track, narrow rectangular plan aligned west-by-north-west to east-by-south-east.

The main structure is constructed of red bricks with two outer courses of Staffordshire blue engineering bricks. A lattice girder river span crosses the river. The viaduct consists of 21 round arches, ranging in height from 12.19m (40ft) to 35.05m (115ft). There is a seven-arch arcade to the south of the river and two seven-arch arcades to the north, separated by a large double-pier along with a double-pier situated to either side of the River Don. The arches rest on tapering rectangular section piers, with plain projecting impost bands and drip moulds above. Parapet walls are supported by brick corbel tables and have flat coping stones; refuges project from the face of the walls above each pier, resembling brick posts. Decorative brick buttresses project from the sides of each double-pier, rising to form posts topped with ashlar capstones that extend above the parapet wall. Similar brick posts are also visible at the ends of the parapet walls.

The double-piers on either side of the River Don support a 45.72m (150ft) long Warren truss bridge, built of two parallel lattice girders linked by transverse cross-bracing and supporting a metal bridge deck laid in concrete. The central six bays of each girder have longitudinal cross-bracing, while the six bays to either side have inclined bracing and the two end bays have double canted bracing. The bridge deck is cantilevered and protected by tall moulded cast-iron posts with flared bases, supporting three-bar tubular railings.