TreeAlive
‹ Cof Cymru: National Historic Assets of Wales, Wales

Cof Cymru: National Historic Assets of Wales · Wales

Gauge House at Claerwen Reservoir

Llanwrthwl, Powys, Wales

A Grade II listed building in Elan Valley, Llanwrthwl, Powys, designated on 14 November 2000.

Ordnance Survey six-inch map, 2nd edition (1888–1913) covering the location of Gauge House at Claerwen Reservoir, Llanwrthwl, Powys, with a pin at the register's coordinates
Ordnance Survey six-inch map, 2nd edition (1888–1913), covering this location. Courtesy of the National Library of Scotland. The pin is ours, placed from the register's coordinates.

The record

Designation
Listed building, Grade II
Broad class
Water Supply and Drainage
Date of designation
14 November 2000
Locality
Elan Valley
Community
Llanwrthwl
Unitary authority
Powys
Country
Wales
Coordinates
52.25809, -3.65845
Cadw reference
24387

Slide toward Today to fade the historical sheet and see the modern map underneath.

David Rumsey Map Collection, Stanford Libraries

5 historical maps cover this location, the earliest the 1608 map "(13) Cambriae Typus." (David Rumsey Map Collection, Stanford Libraries).

Historical maps covering this location

  • 1608 · (13) Cambriae Typus. (David Rumsey Map Collection, Stanford Libraries)
  • 1830 · V.3:11-15:XV. Britisches Reich. A. Kon: England. b. Frstenthum Wales: Shire: 37-40 (David Rumsey Map Collection, Stanford Libraries)
  • 1883 · Watershed map England, Wales 3. (David Rumsey Map Collection, Stanford Libraries)
  • 1898 · 179 Rhyader (Hills) (David Rumsey Map Collection, Stanford Libraries)
  • 1901 · Sheet 14. (David Rumsey Map Collection, Stanford Libraries)

Get directions ↗

This record in Cadw's own full report ↗

Cadw's description

Below Claerwen dam on the W side of the stone-lined channel.

Claerwen Reservoir was built by the City of Birmingham Water Department 1948-52. The consulting engineers were Sir William Halcrow & Partners. The contractor was Edmund Nuttall Sons & Co of London.

Small single-storey building of coursed, rock-faced reconstituted stone and the flat roof concealed behind a projecting coping course. A boarded door is on the E side, above which is a bronze plaque with raised lettering commemorating the inauguration of Claerwen Reservoir in October 1952 by Queen Elizabeth II. The side walls have small metal-framed windows incorporating top-hung casements.

Listed for group value with the Claerwen dam.

Nearby in the register

Other entries of the same register within about three miles of this one, by straight line.

Designated Historic Asset GIS Data, The Welsh Historic Environment Service (Cadw), 2026-09-07, licensed under the Open Government Licence http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/ Cadw, the Welsh Historic Environment Service · Open Government Licence v3.0
See your own family's places on a living map