Kielder Viaduct consists of seven semi-circular masonry skew arches and was built in 1862 to carry the North British Railway across marshy land, which following flooding to create Kielder Water, became the place where Deadwater Burn joins Bakethin Reservoir. Now closed to rail traffic, the bridge is currently used as a footpath.
The viaduct was conceived in a joint project of the Border Counties Railway and the North British Railway as part of the former's extension to Riccarton Junction. The project was completed in 1862 but the Border Counties Railway had been absorbed by the North British Railway two years earlier. In order to meet with the approval of local landowner the Duke of Northumberland who had a shooting lodge nearby, the viaduct was built in a Baronial style and decorated with a battlemented parapet and faux arrow slits.