A sudden rockfall on Tuesday afternoon has forced the closure of the Égratz Viaduct, a key crossing in the Chamonix valley, and resulted in two fatalities and two injuries. Local officials confirmed the deaths but have not disclosed the victims’ identities.
The injured parties have been taken to nearby hospitals where they are receiving medical treatment, though details of their conditions have not been released. The avalanche of rock descended from the steep granite cliffs that tower over the viaduct, prompting authorities to cordon off the structure. Engineers are currently on site evaluating both the viaduct’s integrity and the stability of the rock face above it.
Until a thorough assessment is completed, the road will remain closed. Égratz Viaduct serves as a vital conduit through the narrow, granite‑bounded valley, especially during the summer tourism peak. The region attracts climbers, hikers, and glacier skiers, many of whom travel by car, bus or camper van.
With the viaduct shut, these visitors must seek alternative routes, which are limited, leading to detours, longer travel times and potential economic repercussions for local businesses that rely on summer traffic, including hotels, restaurants, lift operators and mountain guides. Rockfalls are a known hazard in the area due to the region’s steep geology, freeze‑thaw cycles, heavy rainfall and occasional seismic activity. Geologists will investigate whether recent weather conditions or other factors contributed to the incident, though the precise trigger remains under review.
The event has reignited discussions about safety measures for infrastructure situated in alpine environments, where rock faces are continuously weathering and shedding material ranging from small pebbles to larger, dangerous blocks. For now, the viaduct remains inaccessible, and no timetable has been provided for its reopening.
Engineers must first confirm that the cliff above is stable before traffic can be allowed through again, a process that could take several days or longer. In the meantime, local transit services are being rerouted, commuters face extended journeys, and tourists must adjust or cancel plans. The summer season is the economic lifeblood of Chamonix, and the prolonged shutdown of this critical link threatens to impact the valley’s revenue stream directly.
As the community waits for further updates, the focus remains on the ongoing medical care for the injured, the investigation into the rockfall’s cause, and the steps needed to restore safe passage across the Égratz Viaduct.
