Canal Tunnel between Sebastopol and Cwmbran, including attached revetment walls is a Grade II listed building in the Torfaen local planning authority area, Wales. First listed on 30 August 2000. Canal tunnel.

Canal Tunnel between Sebastopol and Cwmbran, including attached revetment walls

WRENN ID
north-hammer-thrush
Grade
II
Local Planning Authority
Torfaen
Constituency
Torfaen MP: Nick Thomas-Symonds (Lab)
Country
Wales
Date first listed
30 August 2000
Type
Canal tunnel
Address
Canal Tunnel between Sebastopol and Cwmbran, including attached revetment walls, Five Locks, Pontnewydd
OS grid reference
ST 287 973
Coordinates
51.67049, -3.03172
Source
Cadw listing

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

Description

The canal tunnel between Sebastopol and Cwmbran is constructed of brown stone and dates from the period of its use. The south portal features a semi-circular arch with a prominent keystone and is made of coursed squared stone. Walls extend southwards at right angles from the portal on both sides. The north portal is similar to the south portal, although the keystone is less prominent, and it has an attached wall at right angles. The tunnel measures approximately 70 meters in length and is lined with stone.

Local climate

Canal Tunnel between Sebastopol and Cwmbran, including attached revetment walls receives an average of 940 mm of rain a year. This makes it wetter than 73% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 72% of listed buildings.

It experiences an average of 41 freeze-thaw cycles a year, more than 79% of listed buildings. Of these, 19 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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