Aqueduct between Bridges No. 78 and 79 Monmouthshire and Brecon Canal is a Grade II listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 9 December 2005. Aqueduct.

Aqueduct between Bridges No. 78 and 79 Monmouthshire and Brecon Canal

WRENN ID
plain-stair-bistre
Grade
II
Local Planning Authority
Brecon Beacons National Park
Constituency
Monmouthshire MP: Catherine Fookes (Lab)
Country
Wales
Date first listed
9 December 2005
Type
Aqueduct
Address
Aqueduct between Bridges No. 78 and 79 Monmouthshire and Brecon Canal, Abergavenny, Llanover
OS grid reference
SO 308 073
Coordinates
51.76061, -3.0034
Source
Cadw listing

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

Description

The aqueduct is a small single arch structure that carries the Monmouthshire and Brecon Canal over the Nant Rhyd-y-meirch. It features a semi-circular arch made of voussoirs and is constructed from squared, faced, and coursed local sandstone. Above the arch, there is a drip course, and the plain parapet has slab coping, which supports a modern timber railing. The abutments of the aqueduct are slightly curved.

Local climate

Aqueduct between Bridges No. 78 and 79 Monmouthshire and Brecon Canal receives an average of 960 mm of rain a year. This makes it wetter than 74% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 71% of listed buildings.

It experiences an average of 45 freeze-thaw cycles a year, more than 86% of listed buildings. Of these, 22 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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  • Detailed attributes — period, style, materials, features
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  1. Aqueduct over Gwenffrywol Grade II 4 m
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  3. Bridge No. 79 Monmouthshire and Brecon Canal Grade II 438 m
  4. Ty-ifor Grade II 444 m
  5. Bridge No. 77 Grade II 547 m
  6. Bryn-hyfryd Grade II 559 m
  7. Granary/Stable at Bryn-hyfryd Grade II 602 m
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  9. Bridge No. 75 Grade II 758 m
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