Pont Aberglaslyn is a Grade II listed building in the Snowdonia National Park local planning authority area, Wales. First listed on 29 May 1968. Bridge.
Pont Aberglaslyn
- WRENN ID
- strange-remnant-acorn
- Grade
- II
- Local Planning Authority
- Snowdonia National Park
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 29 May 1968
- Type
- Bridge
- Address
- Pont Aberglaslyn, Caernarfon, Beddgelert, Gwynedd
- OS grid reference
- SH 594 462
- Coordinates
- 52.99506, -4.09582
- Source
- Cadw listing
Description
Pont Aberglaslyn is a large single-span road bridge, approximately 15 meters long, constructed of rubble. It features a wide segmental arch with rough-dressed voussoirs that are recessed below the arch rings made of narrow stones. On the upstream side, there is a plain, flat stringcourse located below the parapet, while on the downstream side, the voussoirs are particularly long and the stringcourse is gently pointed above the arch. The bridge has a flat carriageway with slab-coped parapets that are splayed at the western approaches and follow the curve of the road to the east.
At the former end of the bridge, there are inserted milestones, likely from the late 19th century or early 20th century, made of slatestone with inscribed letters and figures. The milestone on the downstream parapet reads: "To Portmadog 6 Miles." On the upstream side, there are two milestones; the first is inscribed: "To Beddgelert 1 1/4 Miles," and the second reads: "To Penrhyndeudraeth 6 Miles."
Curved rubble revetment walls extend from the parapets on both sides for about 25 meters, following the course of the road.
Local climate
Pont Aberglaslyn sits in one of the wettest parts of the UK, with an average of 1,500 mm of rain a year. This makes it wetter than 98% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 98% of listed buildings.
It experiences an average of 32 freeze-thaw cycles a year, fewer than 58% of listed buildings. Of these, 16 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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