Viaduct over Nant y Lladron is a Grade II listed building in the Snowdonia National Park local planning authority area, Wales. First listed on 27 February 2004. A C19 Infrastructure.
Viaduct over Nant y Lladron
- WRENN ID
- open-stone-heath
- Grade
- II
- Local Planning Authority
- Snowdonia National Park
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 27 February 2004
- Type
- Infrastructure
- Address
- Viaduct over Nant y Lladron, Cwn Prysor, Trawsfynydd, Gwynedd
- OS grid reference
- SH 775 387
- Coordinates
- 52.93218, -3.82335
- Source
- Cadw listing
Description
The viaduct over Nant y Lladron is a late 19th-century structure made of local stone. It features ten round arches.
Local climate
Viaduct over Nant y Lladron sits in one of the wettest parts of the UK, with an average of 1,320 mm of rain a year. This makes it wetter than 95% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 91% of listed buildings.
It experiences an average of 47 freeze-thaw cycles a year, more than 88% of listed buildings. Of these, 28 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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