History in Structure

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Claerwen Dam, including attached footbridges

A Grade II Listed Building in Rhayader (Rhaeadr Gwy), Powys

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Latitude: 52.2593 / 52°15'33"N

Longitude: -3.6575 / 3°39'26"W

OS Eastings: 286969

OS Northings: 263642

OS Grid: SN869636

Mapcode National: GBR 9B.ZVHL

Mapcode Global: VH5CT.KG9W

Plus Code: 9C4R785V+P2

Entry Name: Claerwen Dam, including attached footbridges

Listing Date: 31 July 1995

Last Amended: 31 July 1995

Grade: II

Source: Cadw

Source ID: 16222

Building Class: Transport

Location: Approximately 11 km SW of Rhayader; reached via Elan Valley road. (partly in Llanwrthwl community)

County: Powys

Community: Rhayader (Rhaeadr Gwy)

Community: Rhayader

Traditional County: Radnorshire

Tagged with: Dam Architectural structure

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The great reservoir scheme in the adjacent Elan Valley built by City of Birmingham 1893 to 1904 made provision for future expansion into the Claerwen Valley where the scheme was brought to its current state by the Claerwen dam built between 1948 and 1952. Engineers Sir William Halcrow & Partners.


Masonry-faced concrete dam, approximately 56m high, supports viaduct on 13 elliptical arches; stone parapets. Central arch of viaduct broader, and carries viewing platform with balustrade; end piers of platform run down full height of dam framing stepped spillway. At foot of this, two buttresses with doorways which are linked by bridges (diagonally set) over pool at foot of dam. To ends of dam, stepped spillways with parapet walls, spillways broaden as they drop, walls turn to frame channel in front of foot of dam which is spanned by stone bridge of 2 segmental arches, with iron railings.

Reasons for Listing

Listed as impressive civil engineering project of high architectural quality.

External Links

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