Millbrook Bridge is a Grade II listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 19 July 1963. Bridge.

Millbrook Bridge

WRENN ID
waning-tallow-rush
Grade
II
Local Planning Authority
Brecon Beacons National Park
Constituency
Brecon, Radnor and Cwm Tawe MP: David Chadwick (LD)
Country
Wales
Date first listed
19 July 1963
Type
Bridge
Address
Millbrook Bridge, the Vale of Grwyney, Powys
OS grid reference
SO 239 172
Coordinates
51.84833, -3.10576
Source
Cadw listing

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

Description

Millbrook Bridge is a late 18th-century single-carriageway bridge made of rubble stone that ramps up to the center. The abutments curve outward at the ends and continue on the southeast side as a revetment for the road. The bridge features a segmental arch with tooled voussoirs. Above the arch, there is a thin projecting band, and the low parapet has flat coping stones, some of which have been replaced.

Local climate

Millbrook Bridge sits in a wetter-than-average part of the UK, with an average of 1,040 mm of rain a year. This makes it wetter than 83% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 75% of listed buildings.

It experiences an average of 48 freeze-thaw cycles a year, more than 89% of listed buildings. Of these, 24 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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  • Detailed attributes — period, style, materials, features
  • Flood risk assessment
  • Radon risk assessment
  • Weather exposure and heating demand — rain and frost month by month and year by year, wind direction, solar and humidity
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