Klingnau reservoir

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Klingnau reservoir
Klingnau reservoir
Klingnau reservoir
Location: Kanton Aargau
Tributaries: Aare
Drain: Aare
Bigger cities on the shore: Döttingen , Kleindöttingen , Klingnau , Gippingen
Klingnau Reservoir (Canton Aargau)
Klingnau reservoir
Coordinates 660035  /  270 691 coordinates: 47 ° 35 '3 "  N , 8 ° 14' 12"  O ; CH1903:  660035  /  two hundred and seventy thousand six hundred ninety-one
Data on the structure
Data on the reservoir
Altitude (at congestion destination ) 318  m above sea level M.
Water surface 1.16 km²
Reservoir length 3 km
Reservoir width 500 m
Maximum depth 8.5 m

The Klingnau reservoir is an artificially dammed lake in the Swiss canton of Aargau . It is located in the Jura north of the so-called water castle of Switzerland , on the lower reaches of the Aare just before its confluence with the Rhine and between the city of Klingnau on the right bank and Böttstein and Leuggern on the left bank of the river. The reservoir was created when the Klingnau power plant was built in the 1930s. Today it is a nature reserve and an important habitat for many species of birds.

Most of the Klingnau reservoir is located in the municipality of Leuggern, followed by Böttstein, Döttingen and only then Klingnau.


The villages in the lower Aare valley suffered repeatedly from devastating floods over the centuries. Shortly before the end of the 19th century, flood protection dams were built on both sides of the river , stretching from Böttstein almost to Koblenz . In the process, a loop of the river in the west, near Gippingen , was cut off, from which an oxbow lake later developed, which as a still body of water is only fed by groundwater. An old course from another arm of the river lies below Klingnau.

An extensive meadow landscape had existed on the Aare for a long time .

Around 1900 a hydropower plant was built near Beznau near Böttstein. The oxbow river was partially filled with the excavated material from the upper water channel and covered with forest. About half of the oxbow river (approx. 23 hectares) was preserved as an alluvial forest and is now under nature protection , such as in the Gippinger Grien protected area .

During the First World War, there was already a plan to build a new power station north of Klingnau . After an access road with a feeder bridge had been built, the investors dropped the project because of concerns about the lack of a sales market for the electricity produced. The bridge that had been started remained as a ruin; it was only canceled in 2005 for security reasons.

From 1931 to 1935 the power plant was built near the railway bridge between Koblenz and Felsenau , about one kilometer from the mouth of the Aare. A weir between the flood dams dammed the river water, and so a new lake, around three kilometers long and up to 500 meters wide, formed between the dams. On the right side of the river, the power plant is integrated into the weir.

The Surb opens the Seeanfang from the right into the Aare. The Guntenbach near Leuggern and smaller brooks on both sides of the lake are led outside the dam systems to the north and flow into the river below the power station.

After a few years, several migratory bird species had adopted the newly created water area as a wintering area or breeding ground, and it also offered native bird species a new habitat. The beaver has returned to the area around the lake in recent years.


The Klingnau reservoir is one of the floodplain areas of national importance . If possible, it should be expanded in the next few years.

Water protection

Sludge containing PCB has been found on the bottom of the lake and is to be pumped into the Rhine.


The region at the Klingnau reservoir is a destination for hikers, cyclists and ornithologists. The Klingnau observation tower, built in 2003, stands on the lakeshore near Kleindöttingen .

Individual evidence

  1. ^ Rudolf Siegrist: The Aare near Klingnau: a topographical and scientific study . Zurich 1962
  2. Waldshut district: Klingnau reservoir: Canton Aargau wants to pump toxic sludge into the Rhine - badische-zeitung.de. Retrieved July 3, 2014 .

Web links

Commons : Klingnauer Stausee  - Collection of images, videos and audio files