Iron bridge over River Llynfi is a Grade II* listed building in the Bridgend local planning authority area, Wales. First listed on 9 August 1979. Bridge.

Iron bridge over River Llynfi

WRENN ID
empty-glass-hemlock
Grade
II*
Local Planning Authority
Bridgend
Constituency
Aberafan Maesteg MP: Stephen Kinnock (Lab)
Country
Wales
Date first listed
9 August 1979
Type
Bridge
Address
Iron bridge over River Llynfi, Maesteg
OS grid reference
SS 851 915
Coordinates
51.61085, -3.66052
Source
Cadw listing

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

Description

The Iron bridge over the River Llynfi is a Grade II* listed structure. It features two side castings made of slightly cambered plate measuring 430mm by 50mm thick, supported by arched braces. These span between continuous cast iron bearings built into each vertical ashlar stone abutment, which are designed to accommodate thermal movement. The bridge deck is supported by two intermediate 'T'-beams that are 30cm deep and slightly fish-bellied, carrying rebated iron planks that are approximately 350mm wide, resulting in a total width of 3.13m. The outer frames and T-beams are held apart by two round section iron tie bars. The handrails, which are now made of steel rod, are arranged in three bays on slender square stanchions topped with knop finials, and they are believed to replicate the original ladder design. The fish-bellied beams and iron planks are similar to those supplied by the company for the Duffryn, Llynvi and Porthcawl Railway, established in 1825.

Local climate

Iron bridge over River Llynfi sits in one of the wettest parts of the UK, with an average of 1,220 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 95% of listed buildings.

It experiences an average of 23 freeze-thaw cycles a year, fewer than 76% of listed buildings. Of these, 9 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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