Alwen Reservoir

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Alwen Reservoir
Location	North Wales
Coordinates	53°04′N 3°34′WCoordinates: 53°04′N 3°34′W
Lake type	reservoir
Basin countries	United Kingdom
Max. length	5km

The Alwen Reservoir is a 5km long reservoir near Pentre-Llyn-Cymmer in North Wales, held back by the 27 metre high Alwen Dam. It was built between 1909 and 1921, originally to supply water to the town of Birkenhead, near Liverpool. Today it is part of the River Dee regulation system and is operated by Welsh Water / Dŵr Cymru (DCWW).

The dam is a gravity-arch masonry dam. A large water treatment facility was built below the dam, and a cast iron underground aqueduct laid to Birkenhead. The original water treatment buildings are still standing, but the equipment inside has long gone, replaced by modern plant in a new building.

The operators, Welsh Water / Dŵr Cymru (DCWW) have a scheme to teach children about the importance of water, linked to the National Curriculum Key Stage 2 and offer an on-site classroom and guided tours of the water treatment works to schools. The nearby Outdoor Education Centre at Pentre-Llyn-Cymmer accommodates children during school trips.

The reservoir is very close to Llyn Brenig. It is at the end of a valley, and has no through routes around it for vehicles. However the reservoir has an extensive network of trails (public foot paths as well as forest roads suitable for horse riding, mountain biking and walking).

Footpaths around the reservoir have recently been upgraded (2005/2006) providing better access to the general public and allows greater exploration of the North and South Alwen forests.

Fishing is permitted through permit (which can be purchased from the visitors centre at the nearby Llyn Brenig visitors centre).

Vehicular access is limited due to Forestry Commission controlled gates which are padlocked^{[citation needed]}.