|Tributaries||from Immenrieder Ach|
|Drain||via Zellersee and Wolfegger Ach in Schussen|
|Places on the shore||Kisslegg|
|Location close to the shore||Ravensburg|
|Altitude above sea level|
|Maximum depth||15.6 m|
|Middle deep||6.9 m|
|Catchment area||2.445 km²|
The Obersee , which was formed towards the end of the Würm Ice Age 16,000 years ago, is now used as a fishing lake. Due to its sometimes poor water quality, the lake was included in the “Action Program for the Rehabilitation of Upper Swabian Lakes” of the Tübingen Regional Council.
The catchment area of the Obersee is 2,445 ha. With an area of 25.3 ha and an average depth of 6.9 m (max. Depth = 15.6 m), the volume of the lake is around 1,753,000 cubic meters.
The lake is mainly fed via the Immenrieder Ach , the drainage takes place via the Zellersee and the Wolfegger Ach in the Schussen .
|year||1986||1992||1993||1998 *||2002||2006 *||2008|
|Total PO 4 - phosphorus (µg / l)||150||118||113||103||137||80||96|
|Chlorophyll a (µg / l)||37||32||29||25th||37|
|Chlorophyll a peak (µg / l)||155||83||79||75||126|
|total inorganic nitrogen (mg / l)||1.33||1.26||1.59||1.11|
|Viewing depth (m)||1.1||1.0||1.0||1.3||1.3||1.3||1.1|
|* surface water only|
Landscape protection area
The Obersee is part of the Rötsee landscape protection area, which was designated in 1979 . It is essentially characterized by raised bogs , flat bogs , lakes, ponds and other landscape forms from the Ice Ages and also shows a rich alternation between meadows and arable land and forests. By placing it under protection, the special recreational value of the delightful natural landscape is to be preserved for the general public and the natural character of the landscape characterized by the identified landscape-defining elements is to be preserved.
- Ordinance of the District Office Ravensburg as the lower nature conservation authority on the "Rötsee" landscape protection area in the area of the municipality of Kißlegg and the large district town of Leutkirch in the Allgäu of February 26, 1979 (Ges. Bl. 1980, p. 69).