Torpantau tunnel - W portal is a Grade II listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 17 December 1998. Tunnel portal.
Torpantau tunnel - W portal
- WRENN ID
- riven-keep-umber
- Grade
- II
- Local Planning Authority
- Brecon Beacons National Park
- Constituency
- Brecon, Radnor and Cwm Tawe MP: David Chadwick (LD)
- Country
- Wales
- Date first listed
- 17 December 1998
- Type
- Tunnel portal
- Address
- Torpantau tunnel - W portal, Taf Fechan, Talybont-On-Usk, Powys
- OS grid reference
- SO 050 170
- Coordinates
- 51.84358, -3.37928
- Source
- Cadw listing
Description
The west portal of the Torpantau tunnel is made of coursed rock-faced stone. The parapet wall ends at an angle of about 45 degrees to fit the slope. It features prominent rock-faced voussoirs with diamond-shaped ends and tooled edges, which are also present on the quoins.
Local climate
Torpantau tunnel - W portal sits in one of the wettest parts of the UK, with an average of 1,270 mm of rain a year. This makes it wetter than 94% 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 54 freeze-thaw cycles a year, more than 94% of listed buildings. Of these, 30 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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- 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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