Loch Treig Dam, Lochaber Hydroelectric Scheme And Former Aluminium Smelter

Loch Treig Dam is part of the Lochaber Hydroelectric Scheme and the former aluminium smelter, constructed between 1921 and 1926 under the supervision of engineer William Halcrow and general engineers Balfour Beatty, with some later additions. The dam features a rectangular-section rock fill gravity design, with a coursed random rubble face on the upstream side and a concrete panel fascia on the downstream side. At the top of the dam, there is a continuous spillway, along with a small cantilevered concrete walkway that provides access to the valve controls. The downstream face is flanked by swept-up concrete wave walls, which have been heightened with later additions, and there are additional buttressed walls that run diagonally across the downstream face.