Smardalegill is a small steep sided valley connecting Smardale and the valley of the River Eden with the eastern end of the valley of the River Lune, Scandal beck runs north-northeast through it, as does the former Stainmore Railway.
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The viaduct was designed by Sir Thomas Bouch for the South Durham and Lancashire Union Railway and the construction contracted to Mr Wrigg, costing £11,928 to build.