Bridge over Afon Seiont (partly in Llanddeiniolen Community) is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 27 August 1999. Bridge.
Bridge over Afon Seiont (partly in Llanddeiniolen Community)
- WRENN ID
- fallen-terrace-ivy
- Grade
- II
- Local Planning Authority
- Gwynedd
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 27 August 1999
- Type
- Bridge
- Address
- Bridge over Afon Seiont (partly in Llanddeiniolen Community), Llanrug
- OS grid reference
- SH 533 643
- Coordinates
- 53.15566, -4.19537
- Source
- Cadw listing
Description
This bridge over the Afon Seiont, located partly in the Llanddeiniolen Community, is constructed from roughly coursed rubblestone, featuring irregularly coursed stonework on the coped parapet above a projecting string. It has two semi-circular arches made of red brick voussoirs spanning the river, with a cutwater on the east side. The south abutments are also irregularly coursed, while the road rises to the north to accommodate the arch of a former standard gauge railway. The road then continues in a stone-walled cutting to the old crossing of the former narrow gauge railway.
Local climate
Bridge over Afon Seiont (partly in Llanddeiniolen Community) sits in one of the wettest parts of the UK, with an average of 1,210 mm of rain a year. This makes it wetter than 92% 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 23 freeze-thaw cycles a year, fewer than 75% of listed buildings. Of these, 11 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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