Overview
- A night-time debris flow hit Fréterive on November 23, sending up to about two meters of mud and rock across properties over stretches approaching 200 meters.
- Firefighters evacuated residents including a retired couple who were uninjured, and authorities offered temporary rehousing.
- The municipality set up a command post, installed protective blocks for threatened homes, and began a cleanup expected to take several days.
- Train service on the valley line was halted until further notice between Chambéry and Albertville after the track area was affected.
- RTM and ONF experts linked the event to intense rainfall and thaw acting on material loosened by a November 4 landslide, overwhelming earlier mitigation works.