Cilsan Bridge is a Grade II listed building in the Carmarthenshire local planning authority area, Wales. First listed on 27 August 1999. Bridge.
Cilsan Bridge
- WRENN ID
- sacred-step-moss
- Grade
- II
- Local Planning Authority
- Carmarthenshire
- Constituency
- Caerfyrddin MP: Ann Davies (PC)
- Country
- Wales
- Date first listed
- 27 August 1999
- Type
- Bridge
- Address
- Cilsan Bridge, Llanelli, Llanfihangel Aberbythych
- OS grid reference
- SN 589 214
- Coordinates
- 51.87333, -4.05012
- Source
- Cadw listing
Description
Cilsan Bridge is a fine stone bridge built with three equal spans, designed to withstand the notorious flooding of the River Towy. It features high semi-elliptical arches, each with a span of about 18 meters. The bridge is constructed from squared limestone common masonry in small courses, with ashlar dressings used for the arches, cutwaters, and parapets. The cutwaters have a small offset at mid-height and a sloping top, extending up to parapet level as shallow pilasters. The carriageway is wide, flanked by low parapets on each side, which have grey limestone copings. At the approaches, the carriageway widens, and the parapets are made from a rougher masonry.
Local climate
Cilsan Bridge sits in one of the wettest parts of the UK, with an average of 1,350 mm of rain a year. This makes it wetter than 96% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 94% of listed buildings.
It experiences an average of 35 freeze-thaw cycles a year, more than 56% of listed buildings. Of these, 16 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.
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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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