Wenallt Upper Bridge (Canal Bridge No.141) is a Grade II listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 17 December 1998. Bridge.

Wenallt Upper Bridge (Canal Bridge No.141)

WRENN ID
outer-cobalt-falcon
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
Wenallt Upper Bridge (Canal Bridge No.141), Llanddetti, Talybont-On-Usk, Powys
OS grid reference
SO 123 211
Coordinates
51.88157, -3.27416
Source
Cadw listing

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

Description

Wenallt Upper Bridge, also known as Canal Bridge No. 141, 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 is finished with square end piers. On the eastern side, there is a cast iron plaque displaying the bridge number, which is positioned in relief at the keystone. The towpath runs beneath the bridge on the northern side and includes a stone kerb, while the southern side has a stringcourse that is roughly at water level.

The bridge is reinforced with iron ribs beneath the vault and has a tarmac surface. There is also a lozenge-shaped cast iron weight restriction notice, and signs of repairs can be seen on the parapet.

Local climate

Wenallt Upper Bridge (Canal Bridge No.141) 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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