A newly formed barrier lake in Nepal has raised fears of another major flood just a day after a devastating torrent tore through communities near the Nepal-China border, killing hundreds and leaving many more missing.
Chinese authorities have warned that the lake, created near the confluence of the Chhochen Khola and Purepu Tsangpo rivers, is already overflowing and could breach as additional water pours into the area. The lake was estimated to contain about 2 million cubic metres of water on Thursday morning, while another 3 million cubic metres could enter it over the next three days.
Fresh danger along the Bhotekoshi
The rivers involved originate in Tibet and merge before crossing into Nepal, where the waterway is known as the Bhotekoshi, a major upper tributary of the Trishuli river. A failure of the natural barrier could send a sudden surge downstream, threatening settlements, roads, bridges and other infrastructure already damaged by Wednesday’s disaster.
China’s Ministry of Water Resources is closely tracking the lake and carrying out flood simulations to estimate how a breach could affect downstream areas. Officials are also conducting hydrological analysis as authorities prepare for possible emergency rescue and flood-control operations.
🚨🚨🚨#China alerts new barrier lake forms at #Nepal rivers confluence, posing high breach risk over next 3 days.
A significant barrier lake has formed near the confluence of the Chhochen Khola and Purepu Tsangpo rivers in Nepal, with its water volume estimated at 2 million… pic.twitter.com/XtMiX3YUvs
— Shen Shiwei 沈诗伟 (@shen_shiwei) August 27, 2026
The new threat comes as emergency crews in Nepal continue searching for people swept away by the earlier flood. The torrent struck Rasuwa district on Wednesday morning and ripped through Timure and Syaphrubesi, damaging buildings, roads and bridges before moving downstream toward the Trishuli.
The New York Post reported that experts believe the initial disaster may have been triggered by the collapse of an upstream glacier, producing an enormous wall of water. Geologist Bishal Nath Upreti described the event as a “tsunami from the sky,” according to the report.
Rescue efforts face renewed uncertainty
The New York Post reported that more than 350 people had been killed and over 1,300 remained missing across Nepal and Tibet following the initial flood. It also cited Nepal’s tourism board as saying 54 Americans had been confirmed dead and at least 65 US citizens remained unaccounted for.
Nepalese authorities have restricted movement along important highways and moved residents away from vulnerable locations as rescue teams recover bodies and search affected districts. The newly formed lake now complicates those operations by creating the possibility of another fast-moving flood through the same river system.
Chinese authorities said monitoring would continue as water levels rise. With the temporary barrier already under pressure, officials face an urgent challenge to assess the danger, protect exposed communities and prepare for the possibility that the lake could suddenly give way.
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