Ashford tunnel N Portal (Monmouthshire and Brecon Canal) 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.
Ashford tunnel N Portal (Monmouthshire and Brecon Canal)
- WRENN ID
- slow-render-brook
- 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
- Ashford tunnel N Portal (Monmouthshire and Brecon Canal), Llanddetti, Talybont-On-Usk, Powys
- OS grid reference
- SO 122 217
- Coordinates
- 51.88747, -3.2762
- Source
- Cadw listing
Description
The Ashford Tunnel North Portal is part of the Monmouthshire and Brecon Canal and is constructed from sandstone rubble. It features a round arched entrance with a stone keystone and brick voussoirs. The parapet on the roadside is positioned closely against and partially overlaps the eastern side of the arch. The towpath does not extend through the tunnel, as boats were moved through by being shafted; there is a track that runs across the top of the tunnel.
Local climate
Ashford tunnel N Portal (Monmouthshire and Brecon Canal) sits in one of the wettest parts of the UK, with an average of 1,180 mm of rain a year. This makes it wetter than 90% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 78% of listed buildings.
It experiences an average of 57 freeze-thaw cycles a year, more than 96% of listed buildings. Of these, 32 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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