Bridge over Afon Morlais (partly in Llannon Community) is a Grade II listed building in the Carmarthenshire local planning authority area, Wales. First listed on 12 January 1999. Bridge.

Bridge over Afon Morlais (partly in Llannon Community)

WRENN ID
turning-gallery-sienna
Grade
II
Local Planning Authority
Carmarthenshire
Constituency
Llanelli MP: Dame Nia Griffith (Lab)
Country
Wales
Date first listed
12 January 1999
Type
Bridge
Address
Bridge over Afon Morlais (partly in Llannon Community), Gelliwernen Wood, Llangennech
OS grid reference
SN 545 052
Coordinates
51.72677, -4.10664
Source
Cadw listing

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

Description

This is a two-arch bridge over the Afon Morlais, constructed from local rubble masonry with ashlar voussoirs. The main arch spans approximately 7 meters and has a deep segmental shape, featuring tall thin voussoirs. Both the upstream and downstream faces have a larger projecting stone acting as a keystone. The smaller arch spans about 2.5 meters and shares a similar shape and detailing. There are large centering bearing holes at the springing line of the larger arch. The pier located in the water has starlings on both the upstream and downstream sides. The carriageway measures about 3.6 meters in width between the parapets. The parapets are tall, with the upstream side retaining original round copings, while the coping on the downstream side is mortared. The downstream parapet also returns a short distance on the south side.

Local climate

Bridge over Afon Morlais (partly in Llannon Community) sits in one of the wettest parts of the UK, with an average of 1,450 mm of rain a year. This makes it wetter than 98% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 99% of listed buildings.

It experiences an average of 12 freeze-thaw cycles a year, fewer than 89% of listed buildings. Of these, 4 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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