Lonlas or Llwynbrydrau bridge is a Grade II listed building in the Swansea local planning authority area, Wales. First listed on 16 January 2004. Bridge.

Lonlas or Llwynbrydrau bridge

WRENN ID
quiet-balcony-acorn
Grade
II
Local Planning Authority
Swansea
Constituency
Neath and Swansea East MP: Carolyn Harris (Lab)
Country
Wales
Date first listed
16 January 2004
Type
Bridge
Address
Lonlas or Llwynbrydrau bridge, Peniel Green, Llansamlet
OS grid reference
SS 704 972
Coordinates
51.65915, -3.87395
Source
Cadw listing

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

Description

Lonlas or Llwynbrydrau bridge is a road bridge that crosses a railway. It is constructed from rubble stone and features tooled stone voussoirs that form a segmental single arch. The bridge has rubble stone parapets, which include a plinth on the inner sides. The western parapet is flat-topped and has a coping stone, while the eastern parapet is roughly humped. The splayed abutments slope down and are topped with tooled stone copings.

Local climate

Lonlas or Llwynbrydrau bridge sits in one of the wettest parts of the UK, with an average of 1,400 mm of rain a year. This makes it wetter than 97% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 97% of listed buildings.

It experiences an average of 21 freeze-thaw cycles a year, fewer than 78% of listed buildings. Of these, 8 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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  • 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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