Llong Bridge is a Grade II listed building in the Flintshire local planning authority area, Wales. First listed on 5 August 1997. Bridge.

Llong Bridge

WRENN ID
winter-basalt-khaki
Grade
II
Local Planning Authority
Flintshire
Constituency
Clwyd East MP: Becky Gittins (Lab)
Country
Wales
Date first listed
5 August 1997
Type
Bridge
Address
Llong Bridge, Argoed
OS grid reference
SJ 261 623
Coordinates
53.1534, -3.10526
Source
Cadw listing

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

Description

Llong Bridge is constructed of rubble with ashlar dressings. It features a broad segmented arch over the River Alyn and a smaller semi-circular flood arch to the north. Both arches are made of dressed stone, with the main arch positioned between piers that have a string course running between them. The parapet consists of flat coping stones, and the bridge is connected to splayed walls on each side.

Local climate

Llong Bridge receives an average of 910 mm of rain a year. This makes it wetter than 68% of listed buildings in the UK. Its exposure to wind-driven rain is lower than that of 86% of listed buildings.

It experiences an average of 30 freeze-thaw cycles a year, fewer than 64% of listed buildings. Of these, 15 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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  • 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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