Ancient Monuments

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Aberlleiniog Fish Weir I

A Scheduled Monument in Llangoed, Isle of Anglesey (Ynys Môn)

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Latitude: 53.2899 / 53°17'23"N

Longitude: -4.0672 / 4°4'2"W

OS Eastings: 262298

OS Northings: 378983

OS Grid: SH622789

Mapcode National: GBR 0Z1D.7D

Mapcode Global: WH53W.HKFS

Entry Name: Aberlleiniog Fish Weir I

Scheduled Date: 21 October 2002

Source: Cadw

Source ID: 1031

Cadw Legacy ID: AN142

Schedule Class: Maritime

Category: Fish weir

Period: Post Medieval/Modern

County: Isle of Anglesey (Ynys Môn)

Community: Llangoed

Traditional County: Anglesey


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.

Source: Cadw

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