Railway Viaduct over Nant Clydach (partly in Abercynon Community) is a Grade II listed building in the Rhondda Cynon Taf local planning authority area, Wales. First listed on 26 February 2001. Viaduct.

Railway Viaduct over Nant Clydach (partly in Abercynon Community)

WRENN ID
riven-gutter-jay
Grade
II
Local Planning Authority
Rhondda Cynon Taf
Constituency
Pontypridd MP: Alex Davies-Jones (Lab)
Country
Wales
Date first listed
26 February 2001
Type
Viaduct
Address
Railway Viaduct over Nant Clydach (partly in Abercynon Community), Glyncoch, Pontypridd, Rhondda Cynon Taff
OS grid reference
ST 080 928
Coordinates
51.62656, -3.33041
Source
Cadw listing

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

Description

The Railway Viaduct over Nant Clydach is a three-bay structure built in two phases. The wider section on the west side was constructed between 1837 and 1841, while the narrower section on the east side was completed from 1861 to 1862. Both sections are made of coursed rock-faced stone. In the center, there is a wide elliptical arch that spans the river, supported by projecting impost bands, with the inner sides of the piers now reinforced with concrete. The narrower, round-headed outer arches cross unclassified roads. The parapet features replaced steel railings set on original hammer-dressed coping stones. Stone retaining walls are built against the outer arch abutments, except on the southeast side, which has an earthen bank.

Local climate

Railway Viaduct over Nant Clydach (partly in Abercynon Community) sits in a wetter-than-average part of the UK, with an average of 1,120 mm of rain a year. This makes it wetter than 88% 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 33 freeze-thaw cycles a year, fewer than 53% of listed buildings. Of these, 14 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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