Portal at west end of Llandygai Tunnel is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 24 May 2000. Tunnel portal.
Portal at west end of Llandygai Tunnel
- WRENN ID
- spare-step-pigeon
- Grade
- II
- Local Planning Authority
- Gwynedd
- Constituency
- Bangor Aberconwy MP: Claire Hughes (Lab)
- Country
- Wales
- Date first listed
- 24 May 2000
- Type
- Tunnel portal
- OS grid reference
- SH 593 707
- Coordinates
- 53.21531, -4.10711
- Source
- Cadw listing
Description
The portal at the west end of Llandygai Tunnel is made of purplish red brick with pink sandstone detailing. It features a single round-headed arch leading into the tunnel, which is supported by rusticated voussoirs and flanked by raking pilaster buttresses. Above the arch, there is a corbelled stone cornice, along with an additional band of stonework at the parapet. The interior of the tunnel has a brick soffit.
Local climate
Portal at west end of Llandygai Tunnel sits in one of the wettest parts of the UK, with an average of 1,210 mm of rain a year. This makes it wetter than 92% 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 37 freeze-thaw cycles a year, more than 67% of listed buildings. Of these, 19 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 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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