Donaudüker, Underground water infrastructure in Linz, Austria
The Donaudüker forms a 375-meter tunnel beneath the Danube River, connecting Steyregg and Linz through three wastewater pipes and one freshwater line.
Construction began in September 1974, implementing pressing techniques that were revolutionary for infrastructure projects of this scale in Southern Germany and Austria.
The facility represents a milestone in Austrian engineering, demonstrating the technical capabilities of the 1970s through its precise construction methods.
The system processes 200 to 350 liters per second during normal weather conditions and can handle up to 1,200 liters per second during rainfall.
Electric lights illuminate the tunnel's interior, which descends 25 meters below the Danube River through a northern entrance building with a 16-meter diameter.
Location: Steyregg
Location: Linz
Inception: September 23, 1974
GPS coordinates: 48.31233,14.33192
Latest update: March 3, 2025 16:03
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