- Level of difficulty: difficult, WW IV+ / V
- Distance: about 10 kilometers
- Duration: 3 hours
The Sanna River, 45 minutes west of Innsbruck, Austria has a short (7km) stretch between Tobadil and Landeck that is navigable.
Because of the low volume and tight steep canyon the Sanna is quite rigorous when compared to other Alpine rivers. It is rated as a Class V river which is quite accurate when the water is flowing over the damn but drops to a Class IV+ during controlled releases.