Shaft is a Grade C listed building in the Loch Lomond and the Trossachs National Park local planning authority area, Scotland. First listed on 4 May 2006. Bridge.

Shaft

WRENN ID
wild-grate-cobweb
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
4 May 2006
Type
Bridge
OS grid reference
NS 439 996
Coordinates
56.16401, -4.51437
Source
Historic Environment Scotland listing

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

Description

The building is a ventilation shaft designed by James M Gale in 1887, located in the Loch Lomond and Trossachs National Park. It features a single-span, segmental-arched aqueduct bridge with a deep parapet wall that contains a conduit and large pyramidal-capped end piers. The structure is made of mass concrete faced with snecked, coursed Ben Cruachan granite. It includes a string course and a coped parapet, with tubular cast-iron railings adorned with ornamental flower motifs at the heads of the uprights. An early 20th-century concrete cover is also present.

At each end of the aqueduct, there are circular snecked, bull-faced granite enclosures that serve as ventilation shafts and access chambers. These enclosures have access gates and domed wrought-iron 'birdcage' tops with projecting copes. Additionally, there are stone steps, a retaining wall, and railings leading to the associated subterranean chambers. Security covers were added in 2007.

Local climate

Shaft sits in one of the wettest parts of the UK, with an average of 1,730 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 90% of listed buildings.

It experiences an average of 63 freeze-thaw cycles a year, more than 98% of listed buildings. Of these, 41 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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