Tunnel Approximately 20 Metres West of the Octagon, with Flanking Wall Attached to South is a Grade II listed building in the North Yorkshire local planning authority area, England. First listed on 11 June 1986. Tunnel.
Tunnel Approximately 20 Metres West of the Octagon, with Flanking Wall Attached to South
- WRENN ID
- sombre-arch-sage
- Grade
- II
- Local Planning Authority
- North Yorkshire
- Constituency
- Skipton and Ripon MP: Sir Julian Smith (Con)
- Country
- England
- Date first listed
- 11 June 1986
- Type
- Tunnel
- OS grid reference
- SE 280 689
- Coordinates
- 54.11585, -1.57234
- Source
- Historic England listing
Description
The tunnel, built around 1730, is located approximately 20 metres west of The Octagon Tower in Studley Park. It is likely designed by Robert Doe for John Aislabie. The structure is partly rock-cut and constructed with dressed tufa and limestone blocks in a rustic style. The tunnel measures about 50 metres in length, with a floor that rises steeply and curves to face east at the uphill end, near the Octagon Tower.
The south facade features a round-arched tunnel mouth with large voussoirs and a keystone. Attached to the left is a wall that is approximately 1.5 metres high and 3 metres long, which has a narrow round arch opening onto a terrace walk and viewpoint. The north facade is similar to the south, but its voussoirs and keystone appear almost monolithic. Inside, the tunnel lining includes narrow arched recesses, three on each side, each about 2 metres high, which may have been intended for statues or torcheres. This tunnel forms a group with The Octagon Tower and Mr Aislabie's Kitchen.
Local climate
Tunnel Approximately 20 Metres West of the Octagon, with Flanking Wall Attached to South receives an average of 860 mm of rain a year. This makes it wetter than 62% of listed buildings in the UK. Its exposure to wind-driven rain is lower than that of 59% of listed buildings.
It experiences an average of 46 freeze-thaw cycles a year, more than 87% of listed buildings. Of these, 25 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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- 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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