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Cof Cymru: National Historic Assets of Wales · Wales

Former powder magazine for fog signalling station and enclosure walls

Trearddur, Isle of Anglesey, Wales

A Grade II listed building in North Stack, Trearddur, Isle of Anglesey, designated on 30 June 1998.

Ordnance Survey six-inch map, 2nd edition (1888–1913) covering the location of Former powder magazine for fog signalling station and enclosure walls, Trearddur, Isle of Anglesey, 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
Maritime
Date of designation
30 June 1998
Locality
North Stack
Community
Trearddur
Unitary authority
Isle of Anglesey
Country
Wales
Coordinates
53.32241, -4.68166
Cadw reference
20076

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 1799 map "Ireland." (David Rumsey Map Collection, Stanford Libraries).

Historical maps covering this location

  • 1799 · Ireland. (David Rumsey Map Collection, Stanford Libraries)
  • 1883 · Watershed map England, Wales 3. (David Rumsey Map Collection, Stanford Libraries)
  • 1901 · Sheet 9 and 10. (David Rumsey Map Collection, Stanford Libraries)
  • 1919 · Sheet 41. Anglesey. (David Rumsey Map Collection, Stanford Libraries)
  • 1930 · OS Popular Edition 1919-1947 (National Library of Scotland)

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This record in Cadw's own full report ↗

Cadw's description

Located on the NE corner of Holy Island, on the edge of high cliffs, in an enclosure bounded by a low stone wall. Reached via a rough track over the headland.

Built in 1861 by Trinity House, as a charge store for the the adjacent fog warning cannon. At this time cliff-top cannons were fired throughout the night during foggy weather to warn shipping of coastal dangers. The cannons were made at the Woolwich Arsenal. The building subsequently housed a fog warning klaxon.

A small, single storey building, rectangular in plan, with a narrow, grilled, door to the gable end facing away from the sea. Walls built of coursed rubble; rounded parapets to gable ends, with square step to apex, and quarter-round corbels. Pitched slate roof covering with heavy ridge tiles. The entire building and walls are limewashed. Over the door is the Trinity House coat of arms with '1861' inscribed above and 'MAGAZINE' below. The building is within an enclosure defined by low white-washed rubble walls.

Listed as a good, well-preserved example of one of the specialised building types developed by Trinity House in association with coastal navigation, and of local historical interest as part of the warning system guiding coastal traffic associated with the port of Holyhead, a major port in the C19.

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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