A catastrophic flash flood swept down the Bhote Koshi-Trishuli river corridor in Nepal on the morning of 26 August 2026, after a mass of ice, rock and soil that had dammed the river gave way. According to the UN Office for the Coordination of Humanitarian Affairs (OCHA), the flood struck Rasuwagadhi, Timure and Betrawati within roughly an hour, destroying more than 32 bridges along a 42-kilometre stretch and damaging hydropower capacity, border trade facilities and homes across Rasuwa, Nuwakot, Dhading and Chitwan districts.
By 31 August, OCHA’s official update put the confirmed death toll at 903, with 267 people injured and 4,247 still reported missing, figures the agency cautioned were likely to change as search operations continued. The International Federation of Red Cross and Red Crescent Societies (IFRC) estimated that up to 93,000 people may have been affected in total.
A two-year relief operation
The IFRC launched a CHF 25 million (roughly $31 million) emergency appeal covering 24 months of support, a day after releasing close to CHF 1 million in immediate emergency funding to the Nepal Red Cross Society. The appeal is intended to fund shelter, cash assistance, healthcare, household relief items, water and sanitation, and mental health and psychosocial support for affected communities.
A remote and difficult terrain
Rasuwa district sits in mountainous terrain near the border with the Tibet Autonomous Region of China, where damage was also reported. The loss of bridges and roads has complicated access for relief teams, and search operations for those still missing were ongoing as of the latest OCHA update, alongside efforts to restore water, power and transport links to isolated communities.
Why It Matters
The scale of casualties and the number still missing make this one of the deadliest disasters to hit Nepal’s mountain communities in years. With bridges, hydropower and border infrastructure destroyed across a wide stretch of the Bhote Koshi corridor, the humanitarian response will need to sustain support well beyond the initial emergency phase if affected districts are to rebuild.
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