Late on Wednesday, August 20th, a rockslide occurred on the descent of the Égratz Viaduct, where the road runs alongside the cliff face.
According to Le Dauphiné, a car was struck head-on by rocks. There are several reported casualties and possibly one or two deaths.
Emergency services deployed significant resources, including four ambulances, the SAMU (Paramedic Emergency Medical Services), and the mountain rescue helicopter. A long traffic jam formed behind the accident. Traffic is at a complete standstill.
The Mont Blanc Tunnel is closed to heavy goods vehicles heading towards France, and light vehicles must exit the RN 205 at Servoz (exit 24) and follow the S1 alternative route to rejoin the A40 at Passy at exit 21.
Latest Update 21 Aug 2025
A fatal landslide on the Route Blanche road killed two car passengers this Wednesday evening when their car was struck head-on by rocks falling from the mountain. The two deceased passengers were in their twenties and from the Somme region.
It was around 6:00 p.m. this Wednesday, August 20th, when a boulder broke away from the rock face, ending up on the road leading down to Les Égratz.
The boulder, a few dozen centimeters thick, fell onto the trunk. The passenger vehicle was carrying four occupants from the same family, who did not live in the Haute-Savoie department. The two passengers in the back seat died.
The descent lane of the Égratz viaduct is closed!
Since last night, the descent lane of Les Égratz has been closed until further notice. According to our information, the closure could continue in order to clear the cliff.
All traffic has been diverted to the uphill lane which passes over the viaduct.
Le Dauphiné
