Bridge over Nant Aber-nant stream is a Grade II listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 29 July 2009. Bridge.

Bridge over Nant Aber-nant stream

WRENN ID
hidden-rood-frost
Grade
II
Local Planning Authority
Brecon Beacons National Park
Constituency
Merthyr Tydfil and Aberdare MP: Gerald Jones (Lab)
Country
Wales
Date first listed
29 July 2009
Type
Bridge
Address
Bridge over Nant Aber-nant stream, Llwyn-On Reservoir, Hirwaun, Rhondda Cynon Taff
OS grid reference
SO 004 117
Coordinates
51.79584, -3.44427
Source
Cadw listing

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

Description

This is a wide segmentally arched bridge that spans the Nant Aber-nant stream. It features parapets on both sides of the roadway. The bridge is constructed from bold rock-faced masonry. The parapets have terminal piers with heavy copings that are also rock-faced and have tooled margins. Similar piers are located on either side of the arch, which is made up of rock-faced voussoirs. There is a continuous string-course located below the parapet.

Local climate

Bridge over Nant Aber-nant stream sits in one of the wettest parts of the UK, with an average of 1,270 mm of rain a year. This makes it wetter than 94% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 85% of listed buildings.

It experiences an average of 54 freeze-thaw cycles a year, more than 94% of listed buildings. Of these, 30 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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  • Radon risk assessment
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