Pont Llwyn y Brain is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 31 January 2001. Bridge.
Pont Llwyn y Brain
- WRENN ID
- brooding-outpost-owl
- Grade
- II
- Local Planning Authority
- Gwynedd
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 31 January 2001
- Type
- Bridge
- Address
- Pont Llwyn y Brain, Cwmtirmynach, Llandderfel
- OS grid reference
- SH 909 414
- Coordinates
- 52.95936, -3.62529
- Source
- Cadw listing
Description
Pont Llwyn y Brain is a single-span road bridge built from local rubble. It features a shallow segmental arch made of rough-dressed voussoirs that are set back below the arch rings, which are made of narrow contrasting stones. The bridge has rubble parapets along a flat carriageway, and there are flat buttresses at both ends on the upstream and downstream sides.
Local climate
Pont Llwyn y Brain 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 50 freeze-thaw cycles a year, more than 91% of listed buildings. Of these, 31 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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