It therefore was particularly suitable for building the first motorway crossing the Alpine main chain from 1959 onwards.
Plans for the dam were already drafted in the late 1930s by the German AEG engineering company, when the Kaprun power plant was built north of the Alpine divide.
The water divide further runs eastwards through the Northern Limestone Alps, ending at "Vienna Gate", the steep slopes of the Leopoldsberg (425 m) high above the Danube River.
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Once more the chain bends to the north-west, rising in several lofty peaks (the highest is the Aiguille de la Grande Sassière, 3,751 m), before attaining the considerable depression of the Little St Bernard Pass.
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