Loch Treig Dam, Lochaber Hydroelectric Scheme And Former Aluminium Smelter is a Grade B listed building in the Highland local planning authority area, Scotland. First listed on 14 November 2011. Hydroelectric scheme, industrial.
Loch Treig Dam, Lochaber Hydroelectric Scheme And Former Aluminium Smelter
- WRENN ID
- moated-cloister-lichen
- Grade
- B
- Local Planning Authority
- Highland
- Constituency
- Inverness, Skye and West Ross-shire MP: Mr Angus MacDonald (LD)
- Country
- Scotland
- Date first listed
- 14 November 2011
- Type
- Hydroelectric scheme, industrial
- OS grid reference
- NN 347 771
- Coordinates
- 56.85647, -4.71132
- Source
- Historic Environment Scotland listing
Description
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.
Local climate
Loch Treig Dam, Lochaber Hydroelectric Scheme And Former Aluminium Smelter sits in one of the wettest parts of the UK, with an average of 1,690 mm of rain a year. This makes it wetter than 99% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 89% of listed buildings.
It experiences an average of 82 freeze-thaw cycles a year, more than 99% of listed buildings. Of these, 65 follow at least 1 mm of rain in the preceding 48 hours. Average temperatures at this location have risen by 0.3°C per decade since 1991.
Averages for 1991–2020; temperature trend 1991–2025. Figures describe the wider area (a grid cell of roughly 10 km), not the individual site. Contains modified Copernicus Climate Change Service information 2026.
More on this building
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- No EPC on record for this property
- No sale records on file
- No related consent applications matched
- Detailed attributes — period, style, materials, features
- Flood risk assessment
- Radon risk assessment
- Weather exposure and heating demand — rain and frost month by month and year by year, wind direction, solar and humidity
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