Pont Cynon is a Grade II listed building in the Powys local planning authority area, Wales. First listed on 26 February 2003. Bridge.

Pont Cynon

WRENN ID
seventh-newel-peregrine
Grade
II
Local Planning Authority
Powys
Constituency
Montgomeryshire and Glyndwr MP: Steve Witherden (Lab)
Country
Wales
Date first listed
26 February 2003
Type
Bridge
Address
Pont Cynon, Lake Vyrnwy, Llanwddyn
OS grid reference
SJ 018 200
Coordinates
52.76936, -3.4566
Source
Cadw listing

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

Description

Pont Cynon is a bridge featuring a high elliptical arch with a span of approximately 12 meters. The interior of the arch is constructed of brick, while each side is faced with slate that extends significantly into the arch's interior. The voussoirs have a roughly pecked finish and are integrated into the common stone coursing. A tall keystone is suspended from the string course at the base of the parapet. There is a prominent string course with chiselled margins at both the base of the parapet and at the springing line of the arch. Below this string course, there is a very large stone, and many of the stones display quarry drill marks and lewis holes.

Local climate

Pont Cynon sits in a wetter-than-average part of the UK, with an average of 1,120 mm of rain a year. This makes it wetter than 88% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 78% of listed buildings.

It experiences an average of 55 freeze-thaw cycles a year, more than 95% of listed buildings. Of these, 34 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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  2. Memorial Obelisk to Lake Vyrnwy Workers Grade II 667 m
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  5. Parish Church of St Wddyn Grade II* 912 m
  6. Llanwddyn War Memorial Grade II 982 m
  7. No. 3 Glanrafon, Llanwddyn Grade II 1.1 km
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  9. Water Gauge House on Weir below Lake Vyrnwy Dam Grade II 1.1 km
  10. No. 5 Glanrafon, Llanwddyn Grade II 1.1 km