|Location||Gwynedd, North Wales|
|Primary outflows||Afon Prysor|
|Max. length||4.39 km (2.73 mi)|
|Max. width||2.3 km (1.4 mi)|
|Surface area||4.8 km2 (1.9 sq mi)|
|Average depth||4 m (13 ft)|
|Water volume||40,390,000 m3 (1.426×109 cu ft)|
Llyn Trawsfynydd is a large man-made reservoir situated near the village of Trawsfynydd in Gwynedd, North Wales. With a total surface area of 4.8 km² (1,180 acres) the reservoir is slightly more extensive than Wales's largest natural lake, Llyn Tegid (which covers an area of 4.5 km²).
Although two dozen properties, some of historical significance, were lost in the creation of the lake, there was little local objection at the time. Indeed the power station was regarded as a good thing because it was capable of supplying the whole of North Wales' electricity needs. However local landowners and farmers did object to the loss of rights of way across their former lands. In order to negate long detours round the new lake, a small road was built along the western shore and a footbridge was erected across the narrowest part of the lake.
In 1965 the reservoir became the source for cooling water for the Trawsfynydd nuclear power station which began generating electricity for the UK National Grid. In respect to this new role, one of the lake's dams was rebuilt in the early 1960s to increase the volume of Llyn Trawsfynydd. This was because of priority over usage. Whereas previously the Maentwrog power station had taken all of the water in the lake, the needs of the nuclear plant dictated that the hydro plant would only be able to utilise the top 5 ft (1.5 m) of water.
Since the plant's closure, the lake's water temperature has cooled to natural levels allowing fauna and flora to regenerate. Water continues to be used for hydroelectricity generation.
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