Knucklas Railway Viaduct is a Grade II* listed building in the Powys local planning authority area, Wales. First listed on 8 November 1985. Viaduct.
Knucklas Railway Viaduct
- WRENN ID
- frozen-corridor-gilt
- Grade
- II*
- Local Planning Authority
- Powys
- Constituency
- Brecon, Radnor and Cwm Tawe MP: David Chadwick (LD)
- Country
- Wales
- Date first listed
- 8 November 1985
- Type
- Viaduct
- Address
- Knucklas Railway Viaduct, Beguildy
- OS grid reference
- SO 249 742
- Coordinates
- 52.36112, -3.1029
- Source
- Cadw listing
Description
The Knucklas Railway Viaduct is a 13-bay structure made of snecked, rock-faced stone. It features tapering piers, with the quoins partially rebuilt in blue brick, supporting round arches. The viaduct has a corbelled parapet adorned with battlements and saddleback copings. The abutments are topped with higher round turrets that include blind arrow loops and corbelled, embattled parapets. The lower terminal square piers exhibit similar detailing.
Local climate
Knucklas Railway Viaduct receives an average of 910 mm of rain a year. This makes it wetter than 69% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 57% of listed buildings.
It experiences an average of 52 freeze-thaw cycles a year, more than 93% of listed buildings. Of these, 31 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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- No EPC on record for this property
- No sale records on file
- No related consent applications matched
- Detailed attributes — period, style, materials, features
- Flood risk assessment
- Radon risk assessment
- Weather exposure and heating demand — rain and frost month by month and year by year, wind direction, solar and humidity
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