Gwynedd Archaeological Trust
Regional Historic Environment Record

Cored Ddu Fish Trap, Llanfairpwllgwyngyll

Primary Reference Number (PRN) : 7219
Trust : Gwynedd
Community : Llanfair Pwllgwyngyll
Unitary authority : Ynys Mon
NGR : SH54647159
Site Type (preferred type first) : Unknown FISH WEIR
Status : Scheduled Monument

Description :
A very well preserved dry stone trap. The wall runs out at a right angle from the shore for 70m before tuning through 90 degrees to the east and curving towards a low rocky island 96m to the east. Much of the island is covered at high tide but the southern side stands to a similar height as the gorad wall and forms part of the barrier. A few traces of a wall can be seen on its highest point. The wall then continues for another 80m to the east. A natural channel through the centre of the island appears to have been artificially widened perhaps to allow an easier passage into the trap for the fish. A well defined sluice can be seen at the western end of the southern wall. The eastern side of the sluice is well preserved and contains a U shaped groove which in the latter days of the weir held an iron grating (Lewes 1924). The western side of the sluice is now ruinous. The wall has been breached 5m to the west of the sluice and is very unstable at this point. The wall has lost structural integrity here and the tide flows into the weir through the breach thus causing further damage. The breach was caused when power cables were run to Ynys Gorad Goch in 1997. The wall was reinstated at the time but was obviously poorly built. When the site was surveyed less than a year later a 2m wide breach was visible. (Hopewell, 2000).

Sources :
Hopewell, D. , 2000 , An Assessment of Coastal Fish Weirs and Traps. ( © )
Jones, S. , 1997 , Coastal Erosion Survey - Anglesey , <1>

Events :
40362 : Coastal Erosion Survey: Anglesey (year : 1997)
40492 : An Assessment of Coastal Fish Weirs & Traps (year : 2000)

Related PRNs : 409032

Compiled date : 16-05-1997

The above data are supplied by GAT in partnership with its Local Authorities (Anglesey, Conwy and Gwynedd County Councils, and Snowdonia National Park Authority), © GAT 2019 (and in part © Crown, 2019 - as indicated)
This information is supplied for the purposes of personal interest only and may not be used as part of a commercial project.

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