Low Bridge (Canal Bridge No.156) is a Grade II listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 17 December 1998. Bridge.

Low Bridge (Canal Bridge No.156)

WRENN ID
strange-truss-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 December 1998
Type
Bridge
Address
Low Bridge (Canal Bridge No.156), Pencelli, Talybont-On-Usk, Powys
OS grid reference
SO 086 251
Coordinates
51.91756, -3.32969
Source
Cadw listing

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

Description

Low Bridge, also known as Canal Bridge No. 156, is a hump-back bridge made of rubble sandstone. It features a segmental arch with thin voussoirs and a low parapet that has flat coping. The abutments curve outward on both sides, and the parapet includes square end piers. On the eastern side, there is a cast iron plaque displaying the bridge number, which is cast in relief at the keystone position. The towpath runs under the bridge on the northern side and has a stone kerb, while on the southern side, there is a stringcourse that is roughly at water level. The bridge has a grass track deck and two posts that were once used for lozenge-shaped cast iron weight restriction signs.

Local climate

Low Bridge (Canal Bridge No.156) 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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