Causeway is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 10 December 1992. Causeway.

Causeway

WRENN ID
cold-wall-violet
Grade
II
Local Planning Authority
Gwynedd
Constituency
Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
Country
Wales
Date first listed
10 December 1992
Type
Causeway
Address
Causeway, Nantlle, Llanllyfni
OS grid reference
SH 495 529
Coordinates
53.05234, -4.24572
Source
Cadw listing

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

Description

Causeway is a structure made of slate rubblestone with some boulders at the base and quoins, topped with flat coping. It features a central segmental arch on both sides, flanked by tapered pilasters, with voussoirs and an arch-ring positioned below a string course. This string course extends to either side over square-headed, slate-roofed culverts, with two at the south-west end and three at the north-east end; the culverts at the south-west are still open throughout. The central arch has a rubble soffit. The parapet stands between 1.2 meters and 1.5 meters high, and the structure is approximately 5 meters wide. The road level rises towards the north-east end, where the parapet has partially collapsed.

Local climate

Causeway sits in one of the wettest parts of the UK, with an average of 1,380 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 98% of listed buildings.

It experiences an average of 25 freeze-thaw cycles a year, fewer than 73% of listed buildings. Of these, 12 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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