Wonderful on Tap
Do not swim in our reservoirs
Our reservoirs are purpose built for storing and supplying water.
While our visitor sites are lovely places to enjoy the great outdoors, the reservoirs are deep, have strong currents and hidden infrastructure.
They are not safe places to swim. Please do not swim in our reservoirs.
A little about Llyn Clywedog
Majestic views across mid Wales, and a 72m high dam holding back 50,000 megalitres of water, makes this one of our most spectacular visitor sites.
Why was Llyn Clywedog created here?
The creation of the reservoir was driven by the increasing demands on the River Severn as a water source for Birmingham and the English midlands.
How long did it take to build the dam?
Approximately four years to build; work started in 1963 after the passing of an Act of Parliament ordering its construction and finished in 1967.
What is Llyn Clywedog’s role in the water supply network?
It is not linked directly to the water supply network but instead, exists to regulate the flow of water to the River Severn during the winter months, and to ensure a minimum flow during the summer.