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Some fun facts about Llyn Clywedog
- 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.
- The dam took approximately four years to build; work started in 1963 after the passing of an Act of Parliament ordering its construction and finished in 1967.
- Llyn Clywedog exists to regulate the flow of water to the River Severn during the winter months, and to ensure a minimum flow during the summer.
- The dam is 72m high and is holding back 50,000 megalitres of water.