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Cof Cymru: National Historic Assets of Wales · Wales

Newlands Fish Weir

Valley, Isle of Anglesey, Wales

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

Ordnance Survey six-inch map, 2nd edition (1888–1913) covering the location of Newlands Fish Weir, Valley, 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
19 November 2002
Community
Valley
Unitary authority
Isle of Anglesey
Country
Wales
Coordinates (centre of the scheduled area)
53.29575, -4.56451
SAM number
AN145
Cadw record number
3896

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 1588 map "Ortelius, Abraham: Theatro De La Tierra Universal. 0" (Bayerische Staatsbibliothek, Munich).

Historical maps covering this location

  • 1588 · Ortelius, Abraham: Theatro De La Tierra Universal. 0 (Bayerische Staatsbibliothek, Munich)
  • 1608 · (13) Cambriae Typus. (David Rumsey Map Collection, Stanford Libraries)
  • 1899 · 93 Holyhead (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.

Newlands Fish Weir is a well-preserved example of a post-medieval (AD 1536-1899) fish weir. 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. Newlands Fish Weir comprises a rectilinear weir defined by double-faced stone walls with a rubble core. The inner arm runs at 90 degrees from the shore to the north-west and incorporates a large outcrop of rock. Between the shore and the outcrop, the structure is somewhat fragmentary but a length of single skin boulder walling does survive. From the outcrop, the arm comprises a double-faced wall with rubble core some 1.6m wide and standing to a height of about 1m. It maintains its alignment until it reaches the edge of the river channel and then turns through 90 degrees to the north-east. A breach in the wall at this point may represent the remains of a sluice.

The outer arm runs parallel to the shore for 200m before turning shoreward a few degrees and running in a straight line for a further 100m. It also comprises a double-faced wall standing to a height of between 0.8m and 1.4m. The wall has a pronounced batter, being 1.4m wide at the base narrowing to 1.2m at the top. A rough line of stones continues from the end of the wall towards the shore while a better-preserved spur turns back towards the interior of the weir at an angle of approximately 45 degrees.

The site is large, impressive and well-preserved and retains substantial archaeological potential. The scheduled area is a rectangle some 350m by 300m, aligned on and containing the weir, with its south-eastern boundary formed by the high-water mark.

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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