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Cof Cymru: National Historic Assets of Wales · Wales

Water Gauge House on Weir below Lake Vyrnwy Dam

Llanwddyn, Powys, Wales

A Grade II listed building in Lake Vyrnwy Dam, Llanwddyn, Powys, designated on 26 February 2003.

Ordnance Survey six-inch map, 2nd edition (1888–1913) covering the location of Water Gauge House on Weir below Lake Vyrnwy Dam, Llanwddyn, 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
26 February 2003
Locality
Lake Vyrnwy Dam
Community
Llanwddyn
Unitary authority
Powys
Country
Wales
Coordinates
52.75991, -3.45541
Cadw reference
80938

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)
  • 1795 · To Sir Watkin Williams-Wynn Bart ... the map of the six counties of North Wales is most… (Llyfrgell Genedlaethol Cymru – The National Library of Wales)
  • 1883 · Watershed map England, Wales 3. (David Rumsey Map Collection, Stanford Libraries)
  • 1899 · 136 Bala (Hills) (David Rumsey Map Collection, Stanford Libraries)
  • 1901 · Sheet 9 and 10. (David Rumsey Map Collection, Stanford Libraries)

Get directions ↗

This record in Cadw's own full report ↗

Cadw's description

On the south bank of the River Vyrnwy about 200 m below the dam, beside a public path.

A water gauge house on the weir beneath the Vyrnwy dam, part of the original reservoir works.

A timber-framed apparatus house about 2 m by 3 m, with a tile roof. Timber frame painted brown with white panels. Two-light mullion and transom windows on all four faces; boarded door in addition on the south face. The framing stands on two courses of red plinth bricks and a rock-faced slate base.

A small building forming part of the original Vyrnwy Dam works, in a picturesque style reflecting the architecture of the new Llanwddyn village.

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
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