Overview

• A drop of about one meter in the Lonza river’s impounded lake has lowered water volume to roughly 800,000 cubic meters, reducing the immediate flood threat.
• An estimated nine million cubic meters of ice, rock and mud engulfed Blatten on May 28 after the Birschgletscher collapsed under a rockfall from the Kleine Nesthorn.
• Experts say roughly one-third of the debris is ice, and its thawing could trigger further destabilization and rockfalls in the debris field.
• Downstream communities such as Gampel and Steg remain on alert with continuous monitoring and emergency protocols, though current flood risk is assessed as low.
• Approximately 300 residents were evacuated before the landslide, one person remains missing, and authorities have mobilized psychological support and begun drafting reconstruction plans.