Pennorth railway bridge is a Grade II listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 21 August 1998. Bridge.

Pennorth railway bridge

WRENN ID
ancient-storey-dawn
Grade
II
Local Planning Authority
Brecon Beacons National Park
Constituency
Brecon, Radnor and Cwm Tawe MP: David Chadwick (LD)
Country
Wales
Date first listed
21 August 1998
Type
Bridge
Address
Pennorth railway bridge, Llangors, Powys
OS grid reference
SO 112 259
Coordinates
51.92541, -3.29217
Source
Cadw listing

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

Description

The Pennorth railway bridge is a high bridge that carries the road south of Llangorse Lake over a deep railway cutting. It is constructed from snecked rockfaced sandstone. The arch features diamond-shaped voussoirs with smooth narrow arises, which are also present on the projecting abutments on either side. There is a stringcourse at the level of the parapet, although it is mostly obscured by vegetation. The coping consists of large rockfaced blocks.

Local climate

Pennorth railway bridge sits in one of the wettest parts of the UK, with an average of 1,180 mm of rain a year. This makes it wetter than 90% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 78% of listed buildings.

It experiences an average of 57 freeze-thaw cycles a year, more than 96% of listed buildings. Of these, 32 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.

More on this building

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