Pont Twr is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 25 April 1997. Bridge.

Pont Twr

WRENN ID
still-string-equinox
Grade
II
Local Planning Authority
Gwynedd
Constituency
Bangor Aberconwy MP: Claire Hughes (Lab)
Country
Wales
Date first listed
25 April 1997
Type
Bridge
Address
Pont Twr, Braichmelyn, Bangor, Bethesda
OS grid reference
SH 625 659
Coordinates
53.1731, -4.05735
Source
Cadw listing

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

Description

Pont Twr is a three-arched bridge made of rubble stone, which was widened in the early 19th century. The original northern side features low, rough stone voussoir arches and a rubble parapet. The northwest end has been splayed, possibly during the early 19th century, creating an overhang on the right half of the central arch and refacing on the right arch. The added southern side from the early 19th century includes three shallow elliptical arches with cut slate voussoirs and raised arch rings. There is a string course above the arches, along with low cutwaters and raised piers between them, with the string course broken forward over the piers. The bridge has a rubble parapet topped with edge-on stone coping.

Local climate

Pont Twr sits in one of the wettest parts of the UK, with an average of 1,210 mm of rain a year. This makes it wetter than 92% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 90% of listed buildings.

It experiences an average of 37 freeze-thaw cycles a year, more than 67% of listed buildings. Of these, 19 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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