Tramroad and leat tunnels, Monmouthshire and Brecon Canal is a Grade II listed building in the Torfaen local planning authority area, Wales. First listed on 28 August 1997. Tunnel.

Tramroad and leat tunnels, Monmouthshire and Brecon Canal

WRENN ID
woven-thatch-vermeil
Grade
II
Local Planning Authority
Torfaen
Constituency
Torfaen MP: Nick Thomas-Symonds (Lab)
Country
Wales
Date first listed
28 August 1997
Type
Tunnel
Address
Tramroad and leat tunnels, Monmouthshire and Brecon Canal, Pontymoile, Pontypool
OS grid reference
SO 292 002
Coordinates
51.69622, -3.02465
Source
Cadw listing

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

Description

The Tramroad and leat tunnels on the Monmouthshire and Brecon Canal are a pair of tunnels featuring dressed semi-circular arches with a 1-meter thick pier between them. The tunnels have coursed squared stone revetment on the embankment on either side and above the arches, with the same treatment applied to both faces. The smaller eastern tunnel was designed for a watercourse, while the larger western tunnel was intended for a tramway. It is unclear whether these tunnels were built before the canal. Inside, the tunnels are lined and paved with stone, with a headroom of about 2 meters at the center of the arch.

Local climate

Tramroad and leat tunnels, Monmouthshire and Brecon Canal 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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