Monar Dam And Deanie Tunnel Intake Tower, Glen Affric Hydro Electric Scheme is a Grade B listed building in the Highland local planning authority area, Scotland. First listed on 11 February 2011. Hydroelectric dam, intake tower.
Monar Dam And Deanie Tunnel Intake Tower, Glen Affric Hydro Electric Scheme
- WRENN ID
- spare-hall-spindle
- Grade
- B
- Local Planning Authority
- Highland
- Constituency
- Inverness, Skye and West Ross-shire MP: Mr Angus MacDonald (LD)
- Country
- Scotland
- Date first listed
- 11 February 2011
- Type
- Hydroelectric dam, intake tower
- OS grid reference
- NH 203 393
- Coordinates
- 57.4088, -4.99313
- Source
- Historic Environment Scotland listing
Description
The Monar Dam and Deanie Tunnel Intake Tower, part of the Glen Affric Hydro Electric Scheme, was likely designed by James Williamson and Partners in 1963, with W M Halcrow and Partners as the principal contractors. This prominent dam features a horseshoe-shaped double arch design set in a steep gorge. It has a walkway that oversails the spillway gates, which are supported by concrete piers that are battered on the upstream face. The dam is made of concrete and includes painted steel flap gates for the spillway, along with stepped concrete abutments on the downstream face. The downstream face is slightly flared with an angled lip beneath the gates. Needle valves are located at the base of the downstream face, with a round arched housing positioned above. The upstream profile is arched, featuring a deep lip beneath the spillway gates. To the far left (west) is a small single bay gantry and instrument house, which has large teak doors.
The intake tower is a single bay structure with a flat roof, featuring a large sloping concrete buttress made up of linked individual piers at the rear. This tower is set on a square pedestal that houses the tunnel intake, which is typically below water level. The tower has plain surrounds for a large teak vehicular door and bipartite metal windows.
Local climate
Monar Dam And Deanie Tunnel Intake Tower, Glen Affric Hydro Electric Scheme sits in one of the wettest parts of the UK, with an average of 1,680 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 91% of listed buildings.
It experiences an average of 88 freeze-thaw cycles a year, more than 99% of listed buildings. Of these, 71 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.
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- No sale records on file
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- 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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