Claerwen dam, including attached footbridges (partly in Rhayader community) is a Grade II listed building in the Powys local planning authority area, Wales. First listed on 31 July 1995. Dam.

Claerwen dam, including attached footbridges (partly in Rhayader community)

WRENN ID
pitched-tin-river
Grade
II
Local Planning Authority
Powys
Constituency
Brecon, Radnor and Cwm Tawe MP: David Chadwick (LD)
Country
Wales
Date first listed
31 July 1995
Type
Dam
Address
Claerwen dam, including attached footbridges (partly in Rhayader community), Elan Valley, Llanwrthwl
OS grid reference
SN 868 636
Coordinates
52.25911, -3.65885
Source
Cadw listing

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

Description

Claerwen Dam, including attached footbridges, is located partly in the Rhayader community. For a complete description of this dam, please refer to Record Number 16222 in the Rhayader community.

Local climate

Claerwen dam, including attached footbridges (partly in Rhayader community) sits in one of the wettest parts of the UK, with an average of 1,230 mm of rain a year. This makes it wetter than 92% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 86% of listed buildings.

It experiences an average of 57 freeze-thaw cycles a year, more than 97% of listed buildings. Of these, 35 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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  • Weather exposure and heating demand — rain and frost month by month and year by year, wind direction, solar and humidity
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Nearby listed buildings

  1. Claerwen Dam, including attached footbridges Grade II 95 m
  2. Gauge House at Claerwen Reservoir Grade II 114 m
  3. Road bridge below Claerwen dam (partly in Rhayader community) Grade II 219 m
  4. Llannerch-y-Cawr Grade II* 4.0 km
  5. Carreg Ddu Viaduct and Submerged Dam Grade II* 4.2 km
  6. Foel Valve Tower Grade II* 4.2 km
  7. Craig Coch Dam & Valve Tower Grade II* 5.6 km
  8. Caban Coch Dam (partly in Llanwrthwl community) Grade II* 5.6 km
  9. Caban Coch dam (partly in Rhayader community) Grade II* 5.6 km
  10. Penygarreg Dam & Valve Tower Grade II* 5.7 km