Railway Viaduct (partly in Llandygai community) is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 2 August 1988. House.

Railway Viaduct (partly in Llandygai community)

WRENN ID
distant-foundation-martin
Grade
II
Local Planning Authority
Gwynedd
Constituency
Bangor Aberconwy MP: Claire Hughes (Lab)
Country
Wales
Date first listed
2 August 1988
Type
House
Address
Railway Viaduct (partly in Llandygai community), Maesgeirchen, Bangor
OS grid reference
SH 588 710
Coordinates
53.21762, -4.11617
Source
Cadw listing

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

Description

This railway viaduct features seven semicircular arches and is constructed from rock-faced and heavily tooled red sandstone masonry. The arches are accented with rusticated voussoirs and quoins, while the soffits are made of brick. Each pier has a freestone impost band, and the structure includes a cornice and a plain parapet. The end piers slightly project, and the piers that flank the river have ramped brick bases.

Local climate

Railway Viaduct (partly in Llandygai community) sits in one of the wettest parts of the UK, with an average of 1,210 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 90% of listed buildings.

It experiences an average of 37 freeze-thaw cycles a year, more than 67% of listed buildings. Of these, 19 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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