Pont-y-Llan is a Grade II listed building in the Snowdonia National Park local planning authority area, Wales. First listed on 13 October 1966. Bridge.
Pont-y-Llan
- WRENN ID
- secret-rotunda-grain
- Grade
- II
- Local Planning Authority
- Snowdonia National Park
- Constituency
- Bangor Aberconwy MP: Claire Hughes (Lab)
- Country
- Wales
- Date first listed
- 13 October 1966
- Type
- Bridge
- Address
- Pont-y-Llan, Dolwyddelan, Conwy
- OS grid reference
- SH 736 521
- Coordinates
- 53.05197, -3.88599
- Source
- Cadw listing
Description
Pont-y-Llan is a stone road bridge dated 1808, featuring three arches, with the center arch being significantly larger than the others. The bridge is constructed with roughly-dressed voussoirs that are slightly inset below the arch-rings made of narrow stones. It has low cutwaters on both the upstream and downstream sides. The parapets are made of slab-coped rubble and include plain stringcourses below. At the approaches, the parapets splay out slightly and end in flat rubble pilasters topped with pyramidal caps. An inscribed stone in the center of the northeast parapet wall reads: 'IO OWEN [presumably the builder] MDCCCVIII J DEFFORD SURVEYOR'. The carriageway rises slightly towards the center, and the parapet walls extend beyond the pilasters on the southeast and southwest sides in long arcs of about 20 meters, terminating in additional pilasters similar to the first.
Local climate
Pont-y-Llan sits in one of the wettest parts of the UK, with an average of 1,260 mm of rain a year. This makes it wetter than 93% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 89% of listed buildings.
It experiences an average of 49 freeze-thaw cycles a year, more than 91% of listed buildings. Of these, 30 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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