Lower Viaduct is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 28 May 1999. Viaduct.
Lower Viaduct
- WRENN ID
- north-lead-twilight
- Grade
- II
- Local Planning Authority
- Gwynedd
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 28 May 1999
- Type
- Viaduct
- Address
- Lower Viaduct, Llanberis, Caernarfon
- OS grid reference
- SH 580 595
- Coordinates
- 53.11394, -4.12277
- Source
- Cadw listing
Description
Lower Viaduct is a railway viaduct featuring 13 skewed round-headed arches that rise quickly in height to form an incline, with an additional half arch above the natural rock at the top end. The structure is built from snecked rock-faced rubblestone blocks, which are topped with heavily tooled ashlar coping. The arches are accented with toothed purple brick.
Local climate
Lower Viaduct sits in one of the wettest parts of the UK, with an average of 1,360 mm of rain a year. This makes it wetter than 96% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 95% of listed buildings.
It experiences an average of 40 freeze-thaw cycles a year, more than 78% of listed buildings. Of these, 22 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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