Nepal is open for travel, and most trekking regions were not affected by the Bhotekoshi flood. According to the Trekking Agencies' Association of Nepal (TAAN), Everest, Annapurna, Manang, Mustang, Kanchenjunga, Makalu, Rolwaling and Dolpo continued to operate normally (The Tourism Times). Only routes through the Rasuwa corridor need changes.
On the morning of 26 August 2026, a massive rock-ice avalanche above Langtang sent a wall of debris and water down the Bhotekoshi and Trishuli rivers. It destroyed the Rasuwagadhi border crossing and devastated communities from Rasuwa to Nuwakot and beyond, making it one of Nepal's deadliest disasters since the 2015 earthquake.
As a Kathmandu-based company rooted in the Himalayas since 1979, we have followed the recovery closely. Many of the people affected are guides, porters, teahouse owners and drivers we have worked alongside for decades. This guide explains what happened, where recovery stands today, and what it means for anyone planning to travel in Nepal.
The Bhotekoshi Flood at a Glance
What happened: A rock-ice avalanche broke away from the Langtang Lirung massif at about 5,200 m and turned into a fast debris flood through the Lhende Khola, Bhotekoshi and Trishuli rivers.
When: Wednesday, 26 August 2026, at about 8:37 am Nepal time.
Human toll: At least 1,455 dead and 5,285 missing in Nepal as of 5 October 2026, plus 43 dead and 519 missing in Tibet.
Damage: About Rs. 277.79 billion (US.8 billion) in Nepal, with rebuilding estimated at US.78 billion.
Langtang Valley trek: Reopened on 29 October 2026 via new alternative trails from Dhunche.
Rasuwagadhi–Kerung border: Still closed, with no confirmed reopening date.
Rest of Nepal: Everest, Annapurna, Mustang, Manang, Kanchenjunga and most other trekking regions were not affected.
What Caused the Bhotekoshi Flood?
The Bhotekoshi flood was caused by a rock-ice avalanche, not by rain or a glacial lake outburst. At about 8:37 am on 26 August 2026, a huge section of glacier and bedrock broke away from the Langtang Lirung massif at around 5,200 m and fell roughly 1,200 m into the valley below
(Wikipedia).
The collapse was so large that seismometers around the world recorded it as a magnitude 5.2 event. It was first mistaken for an earthquake, but the US Geological Survey later found the tremor was produced by the collapse itself.
As it fell, the ice and rock picked up loose sediment and turned into a fast, long-running debris flow. It poured into the Lhende Khola, which joins the Bhotekoshi at the Nepal–China border and becomes the Trishuli River downstream.
Within about seven minutes, the flood reached the Rasuwagadhi–Gyirong (Kerung) border crossing. From there it tore through settlements along a 72 km stretch of the Trishuli valley, in places rising as high as 80 m above the normal river level. No rain was reported that morning at the Rasuwa district headquarters.
Why There Was So Little Warning
Nepal and China had flood early-warning systems on this river, but they were designed for monsoon floods and glacial lake outbursts. A sudden avalanche-driven flood moved faster than they could detect, and upstream monitoring stations were swept away before they could send alerts. The first mobile alerts went out at 9:15 am, when nearly 680,000 warning texts were sent within a minute.
Scientists later found that satellite images had shown the glacier speeding up in the weeks before the collapse. Researchers quoted by the BBC, CNN and NPR said climate change, by weakening the permafrost that holds ice and rock together, probably made such an event more likely.
A Corridor Already Under Strain
This was the second major flood here in just over a year. In July 2025, a glacial lake outburst in Tibet destroyed the Miteri (Friendship) Bridge at Rasuwagadhi, and the border only reopened on 1 January 2026.
Note on names: the river hit in 2026 is the upper Trishuli, known locally as the Bhotekoshi. The Bhote Koshi in Sindhupalchok, popular for rafting and about 65 km to the east, is a different river and was not affected by this flood.
The Impact on People, Communities and Infrastructure
The flood struck five districts, Rasuwa, Nuwakot, Dhading, Gorkha and Chitwan, with the worst damage along the Trishuli valley through Timure, Syaphrubesi, Mailung, Betrawati, Trishuli Bazar and Devighat. Figures below are the latest official estimates reported by mid-October 2026
(Wikipedia).
|
Impact |
Figure |
As of |
|
Deaths in Nepal |
At least 1,455 |
5 Oct 2026 |
|
Missing in Nepal |
5,285, including 650 foreign nationals from 38 countries |
5 Oct 2026 |
|
Injured in Nepal |
9,287 |
5 Oct 2026 |
|
Deaths and missing in Tibet |
43 dead, 519 missing |
16 Sep 2026 |
|
People affected |
Over 84,000, including 32,021 children (UNICEF) |
Oct 2026 |
|
Houses destroyed |
About 7,570 |
Oct 2026 |
|
Bridges damaged |
68 suspension bridges and 41 road bridges |
Sep 2026 |
|
Roads damaged |
69 km |
Sep 2026 |
|
Hydropower projects damaged |
12, disrupting about 430 MW (10.6% of Nepal's hydro and solar supply) |
Sep 2026 |
|
Total damage in Nepal |
Rs. 277.79 billion (US.8 billion) |
Oct 2026 |