|Data on the structure|
|Construction time:||- 1938|
|Height above foundation level :||8.5 m|
|Building volume:||26,000 m³|
|Crown length:||165 m|
|Power plant output:||2.2 MW|
|Data on the reservoir|
|Water surface||33 ha|
|Storage space||0.84 million m³|
|Catchment area||71.85 km²|
The Ahauser Stausee (Ahausen reservoir) is a reservoir in the areas of the city of Attendorn and the municipality of Finnentrop , Olpe district , North Rhine-Westphalia . It was created in 1937/1938 and today belongs to the Ruhrverband . The dam is a 165 m wide earth dam, the maximum water depth is 13 m.
The reservoir is primarily used to generate electricity and to equalize the water output by the Biggetalsperre power station . The hydropower plant with two Kaplan turbines in the natural stone- clad power house has an output of 2.2 megawatts , is used to cover peak loads and produces around 3 million kilowatt hours annually. The power plant is operated by Lister- und Lennekraftwerke GmbH .
vertical rock face of the Attendorn-Elsper Doppelmulde
Today the Ahauser reservoir, which stretches from Ahausen Castle to the Schafsbrücke below Schnellenberg Castle , is the quietest of the three Attendorn dams. The other two are the Listertalsperre and the Biggealsperre. Fishing is possible at the reservoir. Every year there is a race of pirates , a popular boat class instead.
The small Attendorn-Finnentrop airfield is located north of the reservoir .
Ahauser Klippen nature reserve and reservoir
Sections of the Ahauser artificial lake belong since 2003 to 23.92 ha large rocks and reservoir nature reserve Ahauser . Most of the area is in the territory of the municipality of Finnentrop. The area is divided into two parts by the state road 539 .