Pont Ystumanner is a Grade II listed building in the Snowdonia National Park local planning authority area, Wales. First listed on 10 April 2000. Bridge.

Pont Ystumanner

WRENN ID
winter-remnant-coral
Grade
II
Local Planning Authority
Snowdonia National Park
Constituency
Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
Country
Wales
Date first listed
10 April 2000
Type
Bridge
Address
Pont Ystumanner, Llanfihangel-Y-Pennant, Gwynedd
OS grid reference
SH 660 078
Coordinates
52.65189, -3.98223
Source
Cadw listing

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

Description

Pont Ystumanner is a bridge constructed from rubble stonework. It features a depressed segmental arch made of voussoirs, which is set back below a regulating course. The arch spans 6.75 meters and rises 1.16 meters above the stream. It has flush spandrels and a parapet that is coped with rubble slate. The carriageway of the bridge is 4.6 meters wide, with parapets that are 0.45 meters high. Additionally, there is a small square flood culvert located in the west abutment.

Local climate

Pont Ystumanner sits in one of the wettest parts of the UK, with an average of 1,390 mm of rain a year. This makes it wetter than 97% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 95% of listed buildings.

It experiences an average of 28 freeze-thaw cycles a year, fewer than 69% of listed buildings. Of these, 13 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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