Authorities in Sikkim have identified 40 high-hazard glacial lakes out of 189 mapped across the Indian Himalayas, classifying 16 as being at the highest risk of a sudden outburst. The assessment follows a late August glacial lake outburst flood in Nepal that killed over a thousand people and destroyed infrastructure, heightening concerns along India’s Himalayan frontier. Sikkim’s Department of Science and Technology is the nodal agency for the assessment, working with a Glacier Hazard commission and a steering committee chaired by the Chief Secretary.
Researchers conducted scientific expeditions between 2024 and mid-2026, using electrical resistivity tomography, bathymetric mapping, and differential GPS surveys to study the high-risk lakes. Three locations have been prioritized for engineering interventions: Shako Chho lake, the Lhonak Valley (the source of a 2023 glacial flood), and the Gurudongmar Lake complex. The strategy combines real-time monitoring equipment with structural mitigation measures to reduce water volume or reinforce natural barriers.
The initiative follows warnings from glaciologists that climate change is accelerating glacial lake formation and expansion across the Himalayas. Sikkim has additionally proposed establishing a regional centre for glaciology to strengthen long-term monitoring and research, with the findings set to support broader early-warning and infrastructure-safety planning for Himalayan states facing increasing glacial hazards.