Tramroad causeway and bridge at Hirwaun Ironworks is a Grade II listed building in the Rhondda Cynon Taf local planning authority area, Wales. First listed on 6 August 2002. Causeway, bridge.
Tramroad causeway and bridge at Hirwaun Ironworks
- WRENN ID
- woven-flagstone-cobweb
- Grade
- II
- Local Planning Authority
- Rhondda Cynon Taf
- Constituency
- Merthyr Tydfil and Aberdare MP: Gerald Jones (Lab)
- Country
- Wales
- Date first listed
- 6 August 2002
- Type
- Causeway, bridge
- Address
- Tramroad causeway and bridge at Hirwaun Ironworks, Rhondda Cynon Taff
- OS grid reference
- SN 958 057
- Coordinates
- 51.74057, -3.50985
- Source
- Cadw listing
Description
The tramroad causeway and bridge at Hirwaun Ironworks is a high single-track structure approximately 100 meters long, constructed of snecked rubble, with some sections rebuilt in coursed rubble. It spans the Afon Cynon with a single segmental arch featuring narrow dressed-stone voussoirs. On the right bank, it is supported by coursed rubble revetments. The flat deck serves as a footpath and retains some stone sleeper blocks, which were overgrown at the time of inspection.
Local climate
Tramroad causeway and bridge at Hirwaun Ironworks sits in one of the wettest parts of the UK, with an average of 1,260 mm of rain a year. This makes it wetter than 93% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 91% of listed buildings.
It experiences an average of 42 freeze-thaw cycles a year, more than 80% of listed buildings. Of these, 20 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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