Loch Sloy Dam, Sloy Awe Hydro Electric Scheme is a Grade B listed building in the Loch Lomond and the Trossachs National Park local planning authority area, Scotland. First listed on 29 March 1996.
Loch Sloy Dam, Sloy Awe Hydro Electric Scheme
- WRENN ID
- graven-chamber-rye
- Grade
- B
- Local Planning Authority
- Loch Lomond and the Trossachs National Park
- Constituency
- Argyll, Bute and South Lochaber MP: Brendan O'Hara (SNP)
- Country
- Scotland
- Date first listed
- 29 March 1996
- OS grid reference
- NN 289 111
- Coordinates
- 56.26166, -4.76338
- Source
- Historic Environment Scotland listing
Description
The Valve Gatehouse at Loch Sloy Dam is part of the Sloy Awe Hydro Electric Scheme, designed by engineer James Williamson for the North of Scotland Hydro Electric Board's technical panel in 1936 and built from 1946 onwards. This large buttress dam features an access roadway that oversails prominent arcaded buttresses, with a fixed spillway integrated into the center alongside a control tower, dominating the upper reaches of the Inveruglas water. The structure is primarily made of shuttered concrete, with some reinforced concrete used for the parapet and the gatehouse control tower. The downstream face is battered, supported by deep buttresses with rounded-headed gaps between them. A large central buttress forms the fixed spillway, which includes a central rib that integrates with a dispersal valve at the base and the control tower at the parapet. The top of the dam features a parapet with small buttressed piers rising from the center of the main buttresses.
The Tunnel Intake and Dispersal Valve Gatehouse is located directly adjacent to the upstream face of the dam on a large concrete pier that incorporates intakes for the tunnel and dispersal valve beneath the waterline. The southeast elevation has large panelled teak vehicular access doors, while the southwest and northeast elevations feature paired narrow rectangular windows.
Local climate
Loch Sloy Dam, Sloy Awe Hydro Electric Scheme sits in one of the wettest parts of the UK, with an average of 2,070 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 94% of listed buildings.
It experiences an average of 73 freeze-thaw cycles a year, more than 99% of listed buildings. Of these, 51 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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Nearby listed buildings
- Valve Gatehouse, Loch Sloy Dam, Sloy Awe Hydro Electric Scheme
- Valve House, Loch Sloy Hydro-Electric Power Station, Inveruglas
- Feeder Pipes, Loch Sloy Hydro-Electric Power Station, Inveruglas
- Craig-An-Arden Viaduct
- Loch Sloy Hydro-Electric Power Station, Inveruglas
- Bungalow, Sloy Power Station, Inveruglas
- Barn, Inveruglas
- West Range, Inveruglas Farmsteading
- Bridge, Sloy Power Station, Inveruglas
- East Range, Inveruglas Farmsteading