Bridge across the Afon Trwsgl with the adjoining tramway bridge is a Grade II listed building in the Snowdonia National Park local planning authority area, Wales. First listed on 19 October 1971. Bridge.
Bridge across the Afon Trwsgl with the adjoining tramway bridge
- WRENN ID
- grey-hall-heron
- Grade
- II
- Local Planning Authority
- Snowdonia National Park
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 19 October 1971
- Type
- Bridge
- OS grid reference
- SH 545 492
- Coordinates
- 53.02077, -4.16942
- Source
- Cadw listing
Description
This is a clapper type stone bridge spanning the Afon Trwsgl, accompanied by an adjoining tramway bridge. The bridge features drystone abutments made of small boulders that support a roadway 3 meters wide. Four stone slabs are still in place, although one slab is missing. To the east of the bridge, there is an embankment and an integral bridge for the quarry tramway that leads away from the slate mill. This area includes a rectangular water leet that stands approximately 2.2 meters high. The embankment is constructed from battered and closely dry-laid slate, with two offsets on both sides.
Local climate
Bridge across the Afon Trwsgl with the adjoining tramway bridge sits in one of the wettest parts of the UK, with an average of 1,550 mm of rain a year. This makes it wetter than 99% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 99% of listed buildings.
It experiences an average of 20 freeze-thaw cycles a year, fewer than 79% of listed buildings. Of these, 8 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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