The Olef Dam is located in the vicinity of the Eifel National Park near Hellenthal within the High Fens-Eifel Nature Park in the county of Euskirchen in the German state of North Rhine-Westphalia. Its reservoir stores around 20 million cubic metres and is fed by the River Olef.
The Olef Dam was built between 1954 and 1959 for two purposes: to protect the surrounding municipalities from floods; and to supply drinking water. In 1965 the valley was completely filled with water for the first time and the dam officially opened. There were two subsequent construction phases to reinforce it: 1962–1965 and 1982–1986. The dam is made of concrete and is of the buttress type and is unique in Germany.
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Hellenthal, Euskirchen, Germany
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