Pont Glyn-diffwys is a Grade II listed building in the Conwy local planning authority area, Wales. First listed on 1 April 1998. Bridge.
Pont Glyn-diffwys
- WRENN ID
- nether-truss-rook
- Grade
- II
- Local Planning Authority
- Conwy
- Constituency
- Bangor Aberconwy MP: Claire Hughes (Lab)
- Country
- Wales
- Date first listed
- 1 April 1998
- Type
- Bridge
- Address
- Pont Glyn-diffwys, Ty-Nant, Llangwm
- OS grid reference
- SH 991 443
- Coordinates
- 52.98693, -3.5037
- Source
- Cadw listing
Description
Pont Glyn-diffwys is a bridge constructed from local rubble stone. It features a single segmental arch that spans approximately 11 meters between rock abutments, with the soffit rising to about 18 meters above the water level. The arch is made of 50-centimeter deep rubble voussoirs that are slightly set in beneath a projecting regulating course. Above this, flush spandrels rise into a stone-coped parapet, which now has safety wires installed. The bridge measures 5.6 meters in width between its parallel sides, providing a level carriageway of 4.7 meters between the parapets, which slightly flare outward at the ends to finish in square piers.
Local climate
Pont Glyn-diffwys sits in a wetter-than-average part of the UK, with an average of 1,110 mm of rain a year. This makes it wetter than 88% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 70% of listed buildings.
It experiences an average of 51 freeze-thaw cycles a year, more than 93% 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.
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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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