Upper Clydach Aqueduct and Overflow on Swansea Canal is a Grade II listed building in the Neath Port Talbot local planning authority area, Wales. First listed on 26 October 1979. Aqueduct.

Upper Clydach Aqueduct and Overflow on Swansea Canal

WRENN ID
kindled-jamb-jay
Grade
II
Local Planning Authority
Neath Port Talbot
Constituency
Brecon, Radnor and Cwm Tawe MP: David Chadwick (LD)
Country
Wales
Date first listed
26 October 1979
Type
Aqueduct
Address
Upper Clydach Aqueduct and Overflow on Swansea Canal, Pontardawe
OS grid reference
SN 721 039
Coordinates
51.71956, -3.85269
Source
Cadw listing

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

Description

The Upper Clydach Aqueduct and Overflow on the Swansea Canal is a canal aqueduct that spans a river. It features a rubble stone segmental arch with voussoirs, measuring approximately 7.5 meters in span and about 1.7 meters in height. On the northwest side, there are two overflows. The parapet is made of squared stone with copper-slag copings on the southeast side, which retains flanking buttresses. However, the northern half of the face has been patched with blue and red bricks and cement blocks. There is a 20th-century railing separating the footpath from the canal. The northwest side has been partly encroached by later bank revetment walls and includes brick patching, but it still retains a two-bay overflow chamber that is in working order, complete with stop planks and an added footbridge above.

Local climate

Upper Clydach Aqueduct and Overflow on Swansea Canal sits in one of the wettest parts of the UK, with an average of 1,400 mm of rain a year. This makes it wetter than 97% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 97% of listed buildings.

It experiences an average of 21 freeze-thaw cycles a year, fewer than 78% 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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