In the Alemannic dialects of the region the name of the lake is the Schluechs or Schlues. Historical sources also spell it with a diphthong: 983 lacus Sluochse, 1095 Schluochsee, 1125 predium Sluocse, 1312 der sê ze Sluoze. Thus it cannot be claimed that the name, as is often asserted, from the Middle High Germanslûch ="pipe, tube", because in this case in the present dialect and the historical sources no diphthong was available. Albert Krieger links the name to the Middle High Germansluocht "ravine". But this meaning is also not accurate.
Location
The Schluchsee, with its height of above sea level, is the highest reservoir in Germany and also the largest lake in the Black Forest. By contrast, the Hornberg Basin is 1,048 metres above sea level, but is the upper basin of a pumped storage hydropower station, rather than a reservoir. The water of the reservoir is relatively cool even in summer because of its high elevation. The best-known settlements around the Schluchsee are on its northern shores and include the eponymous town of Schluchsee and the hamlets of Seebrugg by the dam itself and Aha. The Three Lakes Railway, an extension of the Höllentalbahn, runs from Titisee station along the northern shore to the terminus at Seebrugg.
History
The surface of the original, undammed Schluchsee, a glacier lake, was around 30 metres lower than that of today's reservoir. Despite the dam, the Schluchsee appears natural. The lake is 7.3 km long by 1.4 km across. Its 63.5 m high dam was built between 1929 and 1932, impounding the riverSchwarza. In order to construct this gravity dam, the natural lake had first to be deepened by 13 metres. That was achieved in 1930 by a blasting out a tunnel in the rock. After that the intake structure of the dam could be built. Today the lake has a maximum depth of 61 m. The Schluchsee is part of the Schluchsee hydropower station complex run by the Schluchseewerk which has a number of reservoirs of different heights linked by pumping stations. This complex stretches from Häusern to Waldshut. The Schluchsee is therefore the upper basin of the Häusern pump storage hydropower station. The average power generated by the Häusern power station is 100 Megawatts. In 1982 the Schluchsee became known Germany-wide as the Schlucksee because the German football team 1982 chose the area as their training camp and some players, permitted by the team manager, Jupp Derwall, made full use of it. Excessive alcohol consumption, card games and other escapades showed the subsequent world runners-up in a bad light. In 1983 almost all the water in the reservoir was drawn down for inspection purposes, rendering the normal swimming, fishing and sailing activities impossible. This rare occurrence still drew many visitors, however, because for the first time the drowned settlements were visible again. In recent times there have been several conflicts between the Schluchseewerk and the municipality of Schluchsee over the water level of the lake in summer. Whilst the Schluchseewerk is interested in the optimal, economic use of the water and therefore a considerable reduction in the level of the lake, the town is concerned about losing tourists if the lake falls too low for long periods during the summer and exposes a rather unsightly shoreline.
Tourism
Due to its height above sea level, the water of the Schluchsee is relatively cool even in summer. Nevertheless, the lake is popular particularly with swimmers and sailors. Unlike the Titisee, almost all of the Schluchsee's shoreline is easily accessible. As a result, the Schluchsee is very busy in summer and is a popular local resort - even just across the Swiss border. Skinny dipping on the forested side of the lake occasionally causes offence however. In Seebrugg's station building there is a diving base for diving in the Schluchsee. The Schluchsee is surrounded by a plethora of hiking trails and the entire lake can be circumnavigated on foot along an 18-kilometre-long path which is largely flat and suitable for prams. From May to October, the walks may be combined with boat trips on the MS Schluchsee. In 2001, a roughly 30.45-metre-high viewing tower, the Riesenbühl Tower, was built at Riesenbühl from which there are views over most of the lake.
Walking
The Schluchsee is surrounded by numerous walking trails in the local area. The entire length of the shoreline, about 18 km long, is walkable, mostly level and suitable for prams. From May to October the walks may be combined with boat trips on the pleasure cruiser St. Nikolaus.
