Clashmore Tunnel Ventilation Shaft Enclosures And Sighting Pillar (Former Glasgow Corporation Water Works) is a Grade C listed building in the Loch Lomond and the Trossachs National Park local planning authority area, Scotland. First listed on 18 August 2008. Ventilation shaft enclosure.

Clashmore Tunnel Ventilation Shaft Enclosures And Sighting Pillar (Former Glasgow Corporation Water Works)

WRENN ID
tired-storey-candle
Grade
C
Local Planning Authority
Loch Lomond and the Trossachs National Park
Constituency
Stirling and Strathallan MP: Chris Kane (Lab)
Country
Scotland
Date first listed
18 August 2008
Type
Ventilation shaft enclosure
OS grid reference
NS 485 971
Coordinates
56.14333, -4.43988
Source
Historic Environment Scotland listing

Also on this page: flood risk · radon risk · weather exposure · detailed attributes ↓

Description

The Clashmore Tunnel Ventilation Shaft Enclosures and Sighting Pillar, part of the former Glasgow Corporation Water Works, were built around 1856. The enclosures consist of three circular structures made from random rubble, featuring whinstone and topped with bull-faced sandstone coping. Each enclosure has a domed, wrought-iron 'birdcage' top. The sighting pillar is square in plan, capped with a pyramid, and constructed from rubble masonry, sitting on a raised rubble masonry base at the top of the hill.

Local climate

Clashmore Tunnel Ventilation Shaft Enclosures And Sighting Pillar (Former Glasgow Corporation Water Works) sits in one of the wettest parts of the UK, with an average of 1,520 mm of rain a year. This makes it wetter than 98% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 85% of listed buildings.

It experiences an average of 57 freeze-thaw cycles a year, more than 96% of listed buildings. Of these, 34 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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