Llanrhaeadr-ym-Mochnant Bridge is a Grade II listed building in the Powys local planning authority area, Wales. First listed on 14 August 2003. Bridge.

Llanrhaeadr-ym-Mochnant Bridge

WRENN ID
nether-pinnacle-merlin
Grade
II
Local Planning Authority
Powys
Constituency
Montgomeryshire and Glyndwr MP: Steve Witherden (Lab)
Country
Wales
Date first listed
14 August 2003
Type
Bridge
Address
Llanrhaeadr-ym-Mochnant Bridge, Llanrhaeadr-Ym-Mochnant Village
OS grid reference
SJ 122 260
Coordinates
52.82518, -3.30315
Source
Cadw listing

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

Description

Llanrhaeadr-ym-Mochnant Bridge is a single-arch stone bridge featuring stone parapets. The segmental arch spans approximately 12 meters and is constructed with sandstone voussoirs that decrease in depth from about 800 mm at the springing to 600 mm at the apex. Above the arch, the bridge is made of local slate, with a corbel course located on the extrados of the arch and at the base of the parapets on each side. The masonry is roughly coursed common stone, with smaller stones used in the parapets. The parapets stand about 1 meter high and flare out at each of the four corners, topped with a flat rock-faced coping. The carriageway measures about 6 meters in width and includes side pavements.

Local climate

Llanrhaeadr-ym-Mochnant Bridge sits in a wetter-than-average part of the UK, with an average of 960 mm of rain a year. This makes it wetter than 75% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 61% of listed buildings.

It experiences an average of 45 freeze-thaw cycles a year, more than 86% of listed buildings. Of these, 25 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
  • Sale history — 7 transactions since 1997
  • 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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