Pont-y-Cafnau is a Grade II* listed building in the Merthyr Tydfil local planning authority area, Wales. First listed on 22 August 1975. Bridge.

Pont-y-Cafnau

WRENN ID
calm-finial-larch
Grade
II*
Local Planning Authority
Merthyr Tydfil
Constituency
Merthyr Tydfil and Aberdare MP: Gerald Jones (Lab)
Country
Wales
Date first listed
22 August 1975
Type
Bridge
Address
Pont-y-Cafnau, Park
OS grid reference
SO 037 071
Coordinates
51.75461, -3.39565
Source
Cadw listing

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

Description

Pont-y-Cafnau is a notable structure featuring coursed rubble abutments that support a pair of A-frame trusses, which include braces and vertical "king-posts." The design incorporates raised brackets at the ends of the cross-girders. The deck is supported by straight ironwork girders and retains some original chairs and seating from the tramroad. Modern metal handrails are present, with the exception of one original section that flanks the approach path on the eastern bank.

Local climate

Pont-y-Cafnau 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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