Pentrefelin Tramway Viaduct is a Grade II listed building in the Denbighshire local planning authority area, Wales. First listed on 22 April 1998. Viaduct.

Pentrefelin Tramway Viaduct

WRENN ID
salt-pewter-jet
Grade
II
Local Planning Authority
Denbighshire
Constituency
Clwyd East MP: Becky Gittins (Lab)
Country
Wales
Date first listed
22 April 1998
Type
Viaduct
Address
Pentrefelin Tramway Viaduct, Llangollen, Llantysilio
OS grid reference
SJ 205 437
Coordinates
52.985, -3.18546
Source
Cadw listing

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

Description

The Pentrefelin Tramway Viaduct is a 19th-century structure featuring a rubble stone revetted embankment that is approximately 130 meters long. The track is elevated above the stone-on-edge copings by an additional embankment. The viaduct has three spaced arches, with the center arch being wider and spanning the river Eglwyseg, while there is a narrower flood arch on each side. All arches are adorned with rusticated and margin dressed stone quoins and voussoirs, forming a semi-circular shape, with the keystone slightly emphasized. These arches are flanked by pilaster buttresses. The center arch is noted to carry the date 1857. On the south side, there are seven large raking buttresses, which may have been added later.

Local climate

Pentrefelin Tramway Viaduct receives an average of 920 mm of rain a year. This makes it wetter than 70% of listed buildings in the UK. Its exposure to wind-driven rain is lower than that of 73% of listed buildings.

It experiences an average of 48 freeze-thaw cycles a year, more than 89% of listed buildings. Of these, 28 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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