Pontsarn Railway Viaduct (also in Pant Community) is a Grade II* listed building in the Merthyr Tydfil local planning authority area, Wales. First listed on 22 August 1975. Viaduct.

Pontsarn Railway Viaduct (also in Pant Community)

WRENN ID
half-chalk-holly
Grade
II*
Local Planning Authority
Merthyr Tydfil
Constituency
Merthyr Tydfil and Aberdare MP: Gerald Jones (Lab)
Country
Wales
Date first listed
22 August 1975
Type
Viaduct
Address
Pontsarn Railway Viaduct (also in Pant Community), Vaynor
OS grid reference
SO 045 099
Coordinates
51.77976, -3.38523
Source
Cadw listing

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

Description

The Pontsarn Railway Viaduct is a significant railway structure featuring seven arches. It is constructed with abutments, tall slender piers, and parapets made from coursed irregular-sized rock-faced limestone blocks. Each of the seven segmental arches is formed with limestone voussoirs. The piers are designed with a projecting impost band and a projecting string course located below the parapets. The viaduct spans a straight line of about 138 meters and reaches a maximum height of approximately 28 meters.

Local climate

Pontsarn Railway Viaduct (also in Pant Community) sits in one of the wettest parts of the UK, with an average of 1,270 mm of rain a year. This makes it wetter than 94% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 85% of listed buildings.

It experiences an average of 54 freeze-thaw cycles a year, more than 94% of listed buildings. Of these, 30 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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  6. Tower of Old Church of St Gwynno Grade II 469 m
  7. Gravestone of Robert Thompson Crawshay and surrounding railings Grade II 544 m
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