Pont y Gromlech is a Grade II listed building in the Snowdonia National Park local planning authority area, Wales. First listed on 28 May 1999. Bridge.
Pont y Gromlech
- WRENN ID
- shifting-barrel-hawk
- Grade
- II
- Local Planning Authority
- Snowdonia National Park
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 28 May 1999
- Type
- Bridge
- Address
- Pont y Gromlech, Pass of Llanberis, Llanberis, Gwynedd
- OS grid reference
- SH 629 565
- Coordinates
- 53.08876, -4.04744
- Source
- Cadw listing
Description
Pont y Gromlech is a bridge constructed from roughly coursed rubblestone, featuring stone-on-edge coping. It has a single segmental arch made of voussoirs and an arch-ring. On the southern side, there is a plain square-headed floodwater arch.
Local climate
Pont y Gromlech sits in one of the wettest parts of the UK, with an average of 1,310 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 93% 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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