Pont Lliw is a Grade II listed building in the Snowdonia National Park local planning authority area, Wales. First listed on 20 October 1966. Bridge.

Pont Lliw

WRENN ID
sacred-porch-dust
Grade
II
Local Planning Authority
Snowdonia National Park
Constituency
Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
Country
Wales
Date first listed
20 October 1966
Type
Bridge
Address
Pont Lliw, Llanuwchllyn, Gwynedd
OS grid reference
SH 871 306
Coordinates
52.86176, -3.67717
Source
Cadw listing

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

Description

Pont Lliw is a two-span road bridge dating from the 19th century, featuring associated revetments on both the left and right sides, with the right side including a smaller arch that serves as a flood arch. The main bridge is constructed of coursed and dressed slatestone and has two elegant depressed arches, which are adorned with slatestone ashlar voussoirs and projecting keys. Triangular cutwaters are present on both the upstream and downstream sides, with diminishing courses leading to the top, where they end in flat pilaster sections that support the parapet. Additional flat pilasters are located at both ends of the bridge. The parapet rises slightly in the center, following the gentle curve of the carriageway, and features rough-dressed coping stones along with a stringcourse.

The reveted sections on either side are made of rubble. The right side, which contains the flood arch, features a segmental arch with rough-dressed voussoirs and sandstone parapet copings on the upriver side, while the remaining sections have rough-dressed slatestone. The left side, extending beyond the main bridge section, has similar sloped rubble revetments with slatestone copings. On the upriver left side, there is a pedestrian opening with five descending steps that lead to a footpath.

Local climate

Pont Lliw sits in one of the wettest parts of the UK, with an average of 1,260 mm of rain a year. This makes it wetter than 93% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 86% of listed buildings.

It experiences an average of 50 freeze-thaw cycles a year, more than 92% of listed buildings. Of these, 31 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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  • Sale history — 1 transaction since 2021
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  • Detailed attributes — period, style, materials, features
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  • 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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