One Year After the Birch Glacier Buried Blatten, a Smaller Village Climbs Higher

On the afternoon of May 28, 2025, roughly 9 million cubic metres of rock and ice sheared off the Kleines Nesthorn and crashed onto the Birch Glacier, sending a wall of debris down into the Lötschenthal valley and burying Blatten — a village of about 300 people in the Swiss canton of Valais. The collapse struck around 15:30, nine days after geologists monitoring the mountainside had issued a warning urgent enough to trigger an evacuation of the entire settlement. One person was reported missing. Mayor Matthias Bellwald told reporters that “the unimaginable has happened,” then immediately promised the village had a future.

One year on, the shape of that future is becoming concrete, and the cost of the disaster has been tallied. According to SWI swissinfo.ch, writing on the May 26, 2026 anniversary, the total insured loss from the Blatten landslide is estimated at CHF 255 million ($325 million). Of that, CHF 240 million falls within Switzerland’s natural hazard insurance pool — CHF 210 million for buildings and CHF 30 million for household contents — with the remaining CHF 15 million covering business interruption and motor vehicle damage outside the pool.

DW reported earlier that three-quarters of the village’s residents have remained in the area rather than dispersing elsewhere — a striking number given that most of the physical settlement they lived in is gone. Farmers have brought livestock back. Reconstruction planning is underway with a target date of 2030, but what gets rebuilt will not look like what was destroyed: roughly 70 percent of the former municipal area remains at risk of landslide, so the replacement village will be smaller and sited higher up the slope.

A new year-round road is also under construction, with a projected timeline of three to four years — a piece of infrastructure the old village never had, since winter access was historically limited. The road, combined with the elevated relocation, represents a deliberate attempt to leave the new Blatten less vulnerable to exactly the kind of event that erased the old one, even as the underlying conditions that made the event possible have not changed.

The BBC’s reporting identified the root cause in terms that Swiss officials have been increasingly direct about: accelerating glacier melt and permafrost thaw driven by climate change are destabilising Alpine rock faces at a rate that is turning previously stable mountainsides into active hazard zones. The Birch Glacier collapse was not a one-off freak event so much as an instance of a process that is reshaping the risk map of the Swiss Alps broadly and gradually.

The CHF 255 million price tag, substantial as it is, captures only the insured losses. Blatten was a small, largely agricultural municipality; the economic and social fabric of a village of 300 is not easily reduced to an insurance claim. But the fact that 75 percent of its residents chose to stay in the valley — to wait for a smaller village built in a different place, on a higher slope, around a road that does not yet exist — speaks to an attachment that runs deeper than the infrastructure it was originally built around. Bellwald’s promise, made in the immediate wreckage, turns out to have been grounded in something real.

Sources

• Blatten landslide caused damage totalling CHF255 million — SWI swissinfo.ch
• Switzerland: Blatten glacier collapse, one year on — DW (Deutsche Welle)
• Swiss glacier collapse buries most of village of Blatten — BBC News