Hengsteysee (Lake Hengstey) is a reservoir on the Ruhr river
between the cities of Hagen,
Dortmund and Herdecke, North
Rhine-Westphalia, Germany. It was built in 1929 and is one of five
reservoirs on the Ruhr.
The reservoir is about 4.2 km (2.6 mi) long and has an
average width of 296 meters (971 ft). It begins near the point
Lenne flows into the Ruhr, and ends with the weir and
hydroelectric plant of Hengsteysee. The Klusenberg, a hill that is
part of the Ardey range, is located just north of the Hengsteysee.
There is also a pumped-storage plant on this reservoir, named
Koepchenwerk after Arthur Koepchen.
Hengsteysee fulfills the following four functions:
functions as the lower reservoir of the Koepchenwerk pumped-storage
performs biological purification of water from the Lenne
deposit of sediment from the Lenne
venue for water sports and tourism
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