Nant Du Aqueduct on Swansea Canal (partly in Pontardawe community) is a Grade II listed building in the Neath Port Talbot local planning authority area, Wales. First listed on 20 December 2002. Aqueduct.

Nant Du Aqueduct on Swansea Canal (partly in Pontardawe community)

WRENN ID
silent-cobalt-rye
Grade
II
Local Planning Authority
Neath Port Talbot
Constituency
Brecon, Radnor and Cwm Tawe MP: David Chadwick (LD)
Country
Wales
Date first listed
20 December 2002
Type
Aqueduct
Address
Nant Du Aqueduct on Swansea Canal (partly in Pontardawe community), Ynysmeudwy, Ystalyfera
OS grid reference
SN 741 057
Coordinates
51.73645, -3.82435
Source
Cadw listing

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

Description

The Nant Du Aqueduct is a small structure located on the Swansea Canal, oriented on a northeast-southwest axis. It is built from squared stone and features voussoirs that form a segmental arch, which is approximately 0.6 metres high and spans 4.1 metres.

Local climate

Nant Du Aqueduct on Swansea Canal (partly in Pontardawe community) sits in one of the wettest parts of the UK, with an average of 1,380 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 96% of listed buildings.

It experiences an average of 28 freeze-thaw cycles a year, fewer than 69% of listed buildings. Of these, 12 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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