Pont Dysynni (partly in Llanegryn community) is a Grade II listed building in the Snowdonia National Park local planning authority area, Wales. First listed on 17 June 1966. Bridge.
Pont Dysynni (partly in Llanegryn community)
- WRENN ID
- ruined-spandrel-umber
- Grade
- II
- Local Planning Authority
- Snowdonia National Park
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 17 June 1966
- Type
- Bridge
- Address
- Pont Dysynni (partly in Llanegryn community), Bryn Crug, Bryn-Crug, Gwynedd
- OS grid reference
- SH 599 038
- Coordinates
- 52.61421, -4.07052
- Source
- Cadw listing
Description
Pont Dysynni is a bridge built of local rubble stone. It features four semi-circular arches, each with a span of 6.3 meters, made of squared voussoirs that are set back under a square profile slate regulating course. The arches rise 1.8 meters above the water. The bridge has flush spandrels and a parapet, which is capped with stone flags. The water piers are supported on starlings, with cutwaters that are approximately 120 degrees on each side. From these cutwaters, pilaster buttresses rise to the coping, with one buttress offset. The roadway is 3.75 meters wide between the 0.43-meter parapets and has a hump over the river spans, giving the bridge a slight 'S'-curve in its plan. An iron plate by Isaac of Portmadoc is set into the eastern parapet, prohibiting locomotives from crossing due to the bridge's insufficient strength.
Local climate
Pont Dysynni (partly in Llanegryn community) sits in one of the wettest parts of the UK, with an average of 1,380 mm of rain a year. This makes it wetter than 97% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 95% of listed buildings.
It experiences an average of 23 freeze-thaw cycles a year, fewer than 76% of listed buildings. Of these, 9 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
Sign in or create a free account to unlock:
- 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
Matched applications, energy data and sale records are assembled automatically and may contain errors. Flag incorrect data.
Similar buildings
The closest matches to this building from all 493,000 UK listed buildings, by architecture, period and materials.
this building 1 similar nearby listed buildings