Ynys-y-bont Bridge is a Grade II listed building in the Neath Port Talbot local planning authority area, Wales. First listed on 1 March 2004. Bridge.

Ynys-y-bont Bridge

WRENN ID
floating-pinnacle-claret
Grade
II
Local Planning Authority
Neath Port Talbot
Constituency
Neath and Swansea East MP: Carolyn Harris (Lab)
Country
Wales
Date first listed
1 March 2004
Type
Bridge
Address
Ynys-y-bont Bridge, Treforgan, Crynant
OS grid reference
SN 792 057
Coordinates
51.73778, -3.74957
Source
Cadw listing

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

Description

Ynys-y-bont Bridge is a road bridge that features a single arch made of rock-faced rubble stone, with a relatively large span. The arch is constructed using large rock-faced stone voussoirs and a keystone, with the edges of the arch stones cut smooth. The soffit of the bridge is made of finely worked tooled blocks, with the masonry courses skewed and a rock-faced raised band at the base of the arch on each side. The parapets were rebuilt in the late 20th century, which may have resulted in the loss of a string course below, but they still retain the original large rock-faced stone coping blocks. There are raised coping blocks resembling short piers just before the northwest end of each parapet. The abutments of the bridge curve outward at the southeast end.

Local climate

Ynys-y-bont Bridge sits in one of the wettest parts of the UK, with an average of 1,340 mm of rain a year. This makes it wetter than 96% 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 33 freeze-thaw cycles a year, fewer than 53% 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.

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