Landslide Partially Blocks Teesta, Chyakoong Rivers in North Sikkim; Downstream Alert Issued
A major landslide partially blocked the Teesta and Chyakoong rivers in North Sikkim's Mangan district overnight, prompting authorities to issue alerts for vulnerable downstream communities.The landslide occurred above th…
A major landslide partially blocked the Teesta and Chyakoong rivers in North Sikkim’s Mangan district overnight, prompting authorities to issue alerts for vulnerable downstream communities.
The landslide occurred above the Chyakoong River, opposite OC Bhir, during the night of September 5–6. A large section of hillside along the newly cut Naga–Tosa Road collapsed near the confluence of the two rivers, obstructing their flow and causing water to back up upstream.
The Mangan district administration initially reported that the obstruction in the Teesta had eased and the river was flowing again, though debris continued to partially restrict both waterways. Water levels at Sankalang and Phidang were reported normal, though the water had turned muddy. Officials at both locations were directed to monitor levels continuously.
A subsequent public alert said the Teesta had crossed the danger mark at some locations following a high-flow release from the Dikchu Dam. Authorities warned that water levels could rise further downstream.
Residents along the Teesta and in low-lying areas were advised to remain vigilant, keep essential belongings and documents packed, and prepare to evacuate if instructed. They were also asked to stay away from riverbanks and fast-flowing water.
No deaths or injuries had been reported. Officials were assessing possible property damage.
Official Response and Monitoring
Personnel from Chungthang police station and the Theng check post were monitoring the landslide site. The Police Control Room was directed to alert vulnerable settlements downstream as a precautionary measure. Officials in Singtam, Rangpo, and Gangtok were also tracking the situation.
Residents were told they would receive advance notice if an evacuation became necessary. The Mangan district administration said it was closely monitoring the landslide site and the Teesta river belt, with further updates to follow a detailed assessment.
