Cynghordy Viaduct is a Grade II* listed building in the Carmarthenshire local planning authority area, Wales. First listed on 8 July 1966. Viaduct. 4 related planning applications.
Cynghordy Viaduct
- WRENN ID
- bitter-chapel-spindle
- Grade
- II*
- Local Planning Authority
- Carmarthenshire
- Constituency
- Caerfyrddin MP: Ann Davies (PC)
- Country
- Wales
- Date first listed
- 8 July 1966
- Type
- Viaduct
- Address
- Cynghordy Viaduct, Llandovery, Llanfair-Ar-Y-Bryn, SA20 0LW
- OS grid reference
- SN 808 417
- Coordinates
- 52.06128, -3.73962
- Source
- Cadw listing
Description
Cynghordy Viaduct is a railway viaduct constructed of stone, featuring a slightly curving design. It has 18 round-headed arches that are notably tall, with the arches made of yellow brick arranged in six bands. The stonework consists of rock-faced massive rubble that has been carefully dressed to create a smooth angle at the piers, which are splayed out at their bases. Below the springing of each arch, towards the top of each pier, there are square projecting blocks, likely intended for supporting wooden scaffolding during the construction of the arches. The viaduct is topped with stone flat parapets.
Local climate
Cynghordy Viaduct sits in one of the wettest parts of the UK, with an average of 1,240 mm of rain a year. This makes it wetter than 92% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 85% of listed buildings.
It experiences an average of 46 freeze-thaw cycles a year, more than 87% of listed buildings. Of these, 26 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
- Related listed building consents — 4 applications
- 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
Matched applications, energy data and sale records are assembled automatically and may contain errors. Flag incorrect data.
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