Lock Road Bridge is a Grade II* listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 17 January 1963. House.

Lock Road Bridge

WRENN ID
night-parapet-wren
Grade
II*
Local Planning Authority
Brecon Beacons National Park
Constituency
Brecon, Radnor and Cwm Tawe MP: David Chadwick (LD)
Country
Wales
Date first listed
17 January 1963
Type
House
Address
Lock Road Bridge, Cefn Brynich, Llanfrynach, Powys
OS grid reference
SO 077 272
Coordinates
51.93636, -3.34347
Source
Cadw listing

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

Description

Lock Road Bridge is a road bridge that spans the river Usk. It is constructed of rubble stone and features four elliptical recessed arches, which are supported by stone voussoirs. These arches are separated by full-height cutwaters that include pedestrian refuges. Notably, the southern arch is lower than the other three. The cutwaters are slightly stepped and consist of three tiers, with the bottom tier made of squared stonework. Additionally, there is a square drainage hole from the roadway located over the crown of each arch.

Local climate

Lock Road 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.

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