Canal Bridge No 163 and Cefn Brynich Lock Chamber is a Grade II listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 28 July 2005. Bridge, lock chamber.

Canal Bridge No 163 and Cefn Brynich Lock Chamber

WRENN ID
shadowed-sill-raven
Grade
II
Local Planning Authority
Brecon Beacons National Park
Constituency
Brecon, Radnor and Cwm Tawe MP: David Chadwick (LD)
Country
Wales
Date first listed
28 July 2005
Type
Bridge, lock chamber
Address
Canal Bridge No 163 and Cefn Brynich Lock Chamber, Llanfrynach, Powys
OS grid reference
SO 077 273
Coordinates
51.93689, -3.34368
Source
Cadw listing

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

Description

Canal Bridge No 163 and Cefn Brynich Lock Chamber is a canal bridge and lock chamber made of squared rubble stone. The bridge features a segmental arch with tooled stone voussoirs, which spring from the higher walls of the lock. The rubble stone parapet slopes with the roadway, and there is an iron plaque marked "163" on the east side. The lock has side walls constructed of squared stone, topped with heavy squared stone copings.

Local climate

Canal Bridge No 163 and Cefn Brynich Lock Chamber 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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  • Radon risk assessment
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