Croeserw Viaduct is a Grade II listed building in the Neath Port Talbot local planning authority area, Wales. First listed on 31 July 2000. Viaduct.

Croeserw Viaduct

WRENN ID
sunken-panel-tarn
Grade
II
Local Planning Authority
Neath Port Talbot
Constituency
Aberafan Maesteg MP: Stephen Kinnock (Lab)
Country
Wales
Date first listed
31 July 2000
Type
Viaduct
Address
Croeserw Viaduct, Cymmer, Glyncorrwg
OS grid reference
SS 864 960
Coordinates
51.65165, -3.64289
Source
Cadw listing

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

Description

Croeserw Viaduct is a 7-bay structure built from snecked, rock-faced stone, featuring round-headed brick arches supported by tapering piers. It has two unequally placed shallow buttresses that reach the full height of the parapet, creating defined refuges. The parapet is situated above a string course and is topped with rock-faced copings, although some of the copings and other stonework are now partly missing. The parapets end in square piers.

Local climate

Croeserw Viaduct sits in one of the wettest parts of the UK, with an average of 1,300 mm of rain a year. This makes it wetter than 95% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 93% of listed buildings.

It experiences an average of 39 freeze-thaw cycles a year, more than 74% of listed buildings. Of these, 18 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.

More on this building

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