🌊 The Alpine Rhine: A River Redirected

What you’ll learn

1. A river's alpine beginningTrace the Alpine Rhine from Tomasee through the Ruinaulta and identify how its landscape changes downstream.A small alpine lake and a landslide gorge set the physical conditions for the river below.
2. Two headwaters become oneDistinguish the Vorderrhein and Hinterrhein and explain where they become the Alpine Rhine.Two mountain headwaters follow different gorges before joining at Reichenau-Tamins.
3. A torrent becomes a borderExplain how river training changed a braided valley torrent into a channel that also forms national borders.Flood control and channel works imposed a narrow line on a river that once occupied much more of the valley.
4. Engineering the lake mouthDescribe how cuts, dykes, dredging, and Lake Constance shape the river's lower reach and outflow.The lower Alpine Rhine is an engineered sediment-delivery system whose water and load enter a large lake.

Questions this course answers

Grounded in trusted sources

• International Commission for the Protection of the Rhine (ICPR), Alpine Rhine / Lake Constance — Vorderrhein rises at 2,340 m from Lake Tomasee, Graubünden; Hinterrhein near the San Bernardino pass, Via Mala several hundred metres deep; Vorder- and Hinterrhein meet at Reichenau to form the Alpine Rhine; lower course is the border of Switzerland (west) with Liechtenstein and Austria (east); inland delta into Lake Constance at Bregenz; lake 535 km², third-largest inland lake in Middle Europe after Geneva and Balaton; Seerhein about 4 km from Obersee into Untersee, 30 cm lower; Rhine kilometre zero at the old Rhine bridge in Constance; Alpine Rhine water table may vary up to one metre per day from hydropower reservoir operations
• Encyclopaedia Britannica, Alpenrhein River — 63 miles / 102 km from the Vorder-/Hinterrhein confluence to Lake Constance; Reichenau to Sargans entirely in Switzerland; next 19 miles / 30 km the Swiss–Liechtenstein border; last stretch Swiss–Austrian; waters thick with mud
• Encyclopaedia Britannica, Rhine River — two small headwaters in the Swiss Alps; length long given as 820 miles / 1,320 km, about 765 miles / 1,230 km proposed in 2010
• Encyclopaedia Britannica, Lake Constance — glacier basin; Rhine enters in the southeast near Bregenz and leaves west via the Untersee
• UNESCO-Welterbe TektonikArena Sardona, Understand — Flims rockslide is the largest rock avalanche in the Alps; an estimated 9,450 years ago around 10 cubic kilometres of rock fell into the valley
• Internationale Rheinregulierung (IRR), Geschichte — original Alpine Rhine called Europe's greatest torrent (grösster Wildbach Europas); floods of 1888 and 1890; state treaties 1892, 1924 and 1954; Fussacher Durchstich 1895–1900 shortened the course by 7 km, new 5 km mouth Höchst/Lustenau to Hard/Fussach; Diepoldsauer Durchstich opened winter 1923 after 14 years, cut the Hohenems bend, shortened a further 3 km; 1954 treaty narrowed the originally 110 m middle channel below Kriessern; Vorstreckung dikes carry fines into deeper lake; 50,000–100,000 m³ of gravel and sand dredged at the mouth each year
• Bodensee-Wasserversorgung — raw water taken at about 60 m depth in the Überlinger See; lifted about 310 m to Sipplinger Berg; about four million people in Baden-Württemberg through 183 members and 320 towns; 130.3 million m³ supplied in 2023 (press, 12 Nov 2024); 131.7 million m³ in 2022
• Tockner, Uehlinger and Robinson, Rivers of Europe (2009), Rhine chapter — Vorderrhein 71.5 km from Tomasee; Alpine Rhine valley about 93 km; originally braided, active channel at some places wider than 500 m

Every Wunder lesson is built from real, reputable sources — never invented.

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