Cymraeg / English
Historic Landscape Characterisation
Nantglyn Community Denbighshire, and Cerrigydrudion, Pentrefoelas and Llansannan
Earlier 20th-century reservoir superimposed upon medieval and later enclosed landscape.
The area falls within the 19th-century tithe parishes of Cerrigydrudion, Nantglyn, Tiryrabad-isaf (Pentrefoelas) and Henllan. The construction of the early 20th-century reservoir submerged low-lying fields belonging to Ty-isaf, Creigiau'r-bleddiau and Hafod-y-llan-uchaf farmsteads on the north and enclosed moorland on the south side of the river Alwen as well as a number of footbridges and sheepfolds.
Key historic landscape characteristics
The reservoir, built between 1911-16, covers an area of about 1.7km2 within a relatively narrow valley on the southern edge of Mynydd Hiraethog, at a height of about 360m above Ordnance Survey above the dam and 330 below the dam. The reservoir was formed by the damming of the Afon Alwen, a tributary of the Dee river system.
Early activity in the area is represented by a possible prehistoric stone circle or hut circle and a Bronze Age bronze spearhead, both discovered during the construction of the reservoir.
Curved dam of concrete blocks with Italianate valve tower was built as a water supply for Birkenhead between 1911-16 but now supplies north-east Wales. Other contemporary elements below the dam include the older, rendered brick filter house below the modern steel-framed works, the remains of barrack housing built for construction workers, a terrace of six brick workers' houses, with various other features in the landscape around the reservoir itself, including cast-iron gates and iron fencing. Like the Brenig Reservoir, it forms an important present-day resource for sporting and recreational activities including a water-ski training centre, fishing, and walks and picnic areas.
CPAT Sites and Monuments Record;
For further information please contact the Clwyd-Powys Archaeological Trust at this address, or link to the Countryside Council for Wales' web site at www.ccw.gov.uk.
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