Alwen Reservoir

The Alwen Reservoir or Cronfa Alwen is a 5 kilometres long reservoir near Pentre-Llyn-Cymmer in Conwy County Borough, Wales.

The reservoir and dam were constructed between 1911 and 1920 by Alexander Binnie, Son and Deacon for the Corporation of Birkenhead to provide a high quality source of drinking water for the Wirral and parts of Liverpool. The reservoir and dam were built with the authority of an Act of Parliament and although the scheme involved flooding a long valley in central North Wales, the scheme encountered no opposition from local people. An original filter works building enclosing sixteen batteries of six Bell's Patent Filters is now vacant with a modern treatment plant some 100 metres distant. The treatment plant and piped aqueduct continue to supply Birkenhead with water and, despite the proximity of this reservoir to the other River Dee reservoirs, Llyn Celyn, Llyn Brenig and Llyn Tegid, it is not part of the Dee Regulation Scheme and its abstraction is not limited in the same ways as the other sources. It is the only reservoir in the Dee system providing a direct piped supply of water.

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