Dark Bridge (Canal Bridge No 109) is a Grade II listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 21 October 1998. Bridge.

Dark Bridge (Canal Bridge No 109)

WRENN ID
winding-cornice-rook
Grade
II
Local Planning Authority
Brecon Beacons National Park
Constituency
Brecon, Radnor and Cwm Tawe MP: David Chadwick (LD)
Country
Wales
Date first listed
21 October 1998
Type
Bridge
Address
Dark Bridge (Canal Bridge No 109), Pen-Pedair-Heol, Llangattock, Powys
OS grid reference
SO 225 167
Coordinates
51.84385, -3.12614
Source
Cadw listing

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

Description

Dark Bridge, also known as Canal Bridge No 109, is a single-span bridge constructed of rubble sandstone. It features an asymmetrical segmental arch and continuous parapets. The narrow deck of the bridge slopes sharply upward from the north to the south. The arch is made up of thin voussoirs, and on the eastern side, which is downstream, there is a cast iron plaque displaying the bridge number in relief. The parapets are splayed, particularly at a sharp angle to the south. Additionally, a low wall runs parallel to the towpath and is positioned against the northeast side of the bridge.

Local climate

Dark Bridge (Canal Bridge No 109) sits in a wetter-than-average part of the UK, with an average of 1,040 mm of rain a year. This makes it wetter than 83% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 75% of listed buildings.

It experiences an average of 48 freeze-thaw cycles a year, more than 89% of listed buildings. Of these, 24 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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  1. Stop Lock, Monmouthshire and Brecon Canal Grade II 260 m
  2. Pen-pedair-heol Bridge (Canal Bridge No 110) Grade II 440 m
  3. Le Chateau (also known as Llan Wysg) Grade II 610 m
  4. Park Bridge (Canal Bridge No 112) Grade II 951 m
  5. Bridge 107 over the Brecknock & Abergavenny Canal including Iron Sign Grade II 1.4 km
  6. Stables and Coach House at Danygraig Grade II 1.5 km
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  8. Greenhill Villas Grade II 1.5 km
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  10. Crickhowell Castle (remains of) Grade I 1.7 km