Afon Taff Viaduct is a Grade II listed building in the Cardiff local planning authority area, Wales. First listed on 9 March 2004. Viaduct.

Afon Taff Viaduct

WRENN ID
vast-shingle-bone
Grade
II
Local Planning Authority
Cardiff
Constituency
Cardiff North MP: Anna McMorrin (Lab)
Country
Wales
Date first listed
9 March 2004
Type
Viaduct
Address
Afon Taff Viaduct, Melingriffith, Llandaff North
OS grid reference
ST 140 798
Coordinates
51.51105, -3.23975
Source
Cadw listing

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

Description

The Afon Taff Viaduct is a Grade II listed structure built from heavily rusticated stone, featuring smooth faced ashlar only in the original Brunel arch soffits. The stone used is conglomerate for the first two construction phases and likely limestone for the third. The viaduct is approximately 45 meters long and 7 meters high, consisting of five segmental arches supported by bull nosed piers, each topped with a roll moulded cornice. The upstream face has a concrete footbridge added, which is supported by the tops of the cutwaters. The soffits of the arches showcase the three construction phases: the original Brunel design, a widening on the downstream side, and a further widening on the upstream side.

Local climate

Afon Taff Viaduct sits in a wetter-than-average part of the UK, with an average of 1,080 mm of rain a year. This makes it wetter than 86% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 87% of listed buildings.

It experiences an average of 22 freeze-thaw cycles a year, fewer than 77% of listed buildings. Of these, 8 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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