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Latitude: 53.2861 / 53°17'10"N
Longitude: -4.0699 / 4°4'11"W
OS Eastings: 262107
OS Northings: 378573
OS Grid: SH621785
Mapcode National: GBR 0Z0F.NQ
Mapcode Global: WH53W.GN5M
Entry Name: Trecastell Fish Weir
Scheduled Date: 19 November 2002
Source ID: 1032
Cadw Legacy ID: AN141
Schedule Class: Maritime
Category: Fish weir
Period: Post Medieval/Modern
County: Isle of Anglesey (Ynys Môn)
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. Trecastell Fish Weir is rectilinear, defined by spread banks of stone. The inner wall runs at 90 degrees to the shore and is some 310m long. It varies in structure from a 20m wide bank to a double line of facing-stones from 1.1 to 1.6m wide. The outer wall turns at a right angle and runs parallel to the shore for some 250m.
The monument is of national importance for its potential to enhance our knowledge of post-medieval maritime agricultural practices. It is associated with the unusual weir at Gorad Friars Bach (SH 6150 7770) and the pair of weirs at Aberlleiniog (SH 6250 7920) and therefore 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.
Other nearby scheduled monuments