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Cof Cymru: National Historic Assets of Wales · Wales

Aberlleiniog Fish Weir I

Llangoed, Isle of Anglesey, Wales

A scheduled monument in Llangoed, Isle of Anglesey, recorded as Fish Weir (Post Medieval).

Ordnance Survey six-inch map, 2nd edition (1888–1913) covering the location of Aberlleiniog Fish Weir I, Llangoed, 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
Scheduled monument
Site type
Fish Weir
Period
Post Medieval
Date of designation
21 October 2002
Community
Llangoed
Unitary authority
Isle of Anglesey
Country
Wales
Coordinates (centre of the scheduled area)
53.28990, -4.06731
SAM number
AN142
Cadw record number
1031

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)
  • 1896 · Sheet 7. Ordnance Survey of England and Wales. (David Rumsey Map Collection, Stanford Libraries)
  • 1899 · 94 Beaumaris (Hills) (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)

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This record in Cadw's own full report ↗

Cadw's description

The following provides a general description of the Scheduled Monument.

The monument consists of the well-preserved remains of a fish weir, dating to the post-medieval period. A fish weir is usually characterised by a foundation of stone topped with a fence or row of stakes, often with nets attached forming an enclosure within a river or harbour and used for catching, or holding, fish. Aberlleiniog Fish Weir I is rectilinear and defined by spread banks of stone. The inner wall runs at 90 degrees to the shore and is some 300m long. It comprises a stone bank some 8.0m wide and 0.2 m high with a well-defined line of stones along the top standing up to 0.4m in height. The outer wall runs to the south-west at a right angle and is some 220m in length.

The monument is of national importance for its potential to enhance our knowledge of post-medieval maritime agricultural practices. Being associated with Aberlleiniog II (SH 6251 7930) and standing within 1km of the weirs at Gorad Friars Bach (SH 6150 7770) and Trecastell (SH 6210 7860) the site has significant group value. It retains significant archaeological potential, with a strong probability of the presence of associated archaeological features and deposits. The structure itself may be expected to contain archaeological information concerning chronology and building techniques.

The scheduled area comprises the remains described and areas around them within which related evidence may be expected to survive.

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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