A report published by the International Centre for Integrated Mountain Development and the United Nations Environment Programme, has identified 24 out of 2674 moraine dammed glacial lakes in Bhutan as ‘potentially dangerous’.

Described as being likely to burst, eight of the lakes are in the basin that feeds the Pho Chu which flooded in 1994; five in the Mo Chu basin; seven in the Mangde Chu basin; three in the Chamkhar Chu basin and one in the Kuri Chu basin.

In 1994 the partial outburst from the Lugge Tsho caused the Pho Chu flood which claimed 23 lives in Punakha valley.