Pont Garreg-Hylldrem is a Grade II listed building in the Snowdonia National Park local planning authority area, Wales. First listed on 14 May 1998. Road bridge.

Pont Garreg-Hylldrem

WRENN ID
fading-niche-hyssop
Grade
II
Local Planning Authority
Snowdonia National Park
Constituency
Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
Country
Wales
Date first listed
14 May 1998
Type
Road bridge
Address
Pont Garreg-Hylldrem, Llanfrothen, Gwynedd
OS grid reference
SH 615 431
Coordinates
52.96754, -4.06314
Source
Cadw listing

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

Description

Pont Garreg-Hylldrem is a single-span, segmentally-arched road bridge, likely built in the early 19th century. It is constructed of rubble, featuring recessed voussoirs beneath an arch-ring made of narrow stones, with rough-dressed voussoirs. The bridge has slab-coped rubble parapets that rise with the humped carriageway towards the center and are splayed at the approaches. On the downstream side, there is a benchmark at the apex, while the upstream side includes plain terminating buttress piers. The northern parapet extends approximately 4 meters beyond the bridge.

Local climate

Pont Garreg-Hylldrem sits in one of the wettest parts of the UK, with an average of 1,500 mm of rain a year. This makes it wetter than 98% 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 32 freeze-thaw cycles a year, fewer than 58% of listed buildings. Of these, 16 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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