Pantglas Bridge is a Grade II listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 27 July 2000. Bridge.

Pantglas Bridge

WRENN ID
cold-lead-dew
Grade
II
Local Planning Authority
Brecon Beacons National Park
Constituency
Monmouthshire MP: Catherine Fookes (Lab)
Country
Wales
Date first listed
27 July 2000
Type
Bridge
Address
Pantglas Bridge, Clydach, Llanelly, Monmouthshire
OS grid reference
SO 229 133
Coordinates
51.81323, -3.11953
Source
Cadw listing

Also on this page: flood risk · radon risk · weather exposure · detailed attributes ↓

Description

Pantglas Bridge is a single-arch bridge constructed of rubble. It features a broad segmental arch made of stone voussoirs. The bridge has a low parapet with cemented coping, and the parapets are skewed out at the ends. The northeast corner of the parapet includes an angled skewed section that is roughly corbelled out over the abutment, which is a later addition; a visible joint separates this from the arch. The southeast abutment is also a later addition and is slightly stepped out from the arch, curving back to form a retaining wall for the road. The west side of the bridge shows evidence of widening, with the arched opening set within a segmental arch that also has stone voussoirs. Additionally, the southwest corner of the parapet is skewed out over an iron lintel.

Local climate

Pantglas Bridge sits in a wetter-than-average part of the UK, with an average of 1,040 mm of rain a year. This makes it wetter than 83% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 75% of listed buildings.

It experiences an average of 48 freeze-thaw cycles a year, more than 89% of listed buildings. Of these, 24 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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