Dan-y-graig Bridge (Canal Bridge No.137) is a Grade II listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 17 December 1998. Bridge.

Dan-y-graig Bridge (Canal Bridge No.137)

WRENN ID
fading-turret-reed
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
Dan-y-graig Bridge (Canal Bridge No.137), Llanddetti, Talybont-On-Usk, Powys
OS grid reference
SO 131 199
Coordinates
51.87125, -3.26319
Source
Cadw listing

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

Description

Dan-y-graig Bridge, also known as Canal Bridge No. 137, is a hump-backed bridge made of rubble sandstone. It features a segmental arch with keystones and thin voussoirs, along with a low parapet that has flat coping. The abutments curve outward on both sides, and the parapet includes square end piers. A towpath runs beneath the bridge on the northern side, where there is a stone kerb, while on the southern side, there is a string course near the water level.

This bridge originally provided access to a field barn and has a grass track surface. The number plate is missing, and although there are cast iron posts for a weight restriction notice, the signs are no longer present.

Local climate

Dan-y-graig Bridge (Canal Bridge No.137) 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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