Authorities in Sikkim’s Mangan district averted a potential flash flood threat after clearing debris that had blocked the natural channels of the Teesta and Chyakoong rivers. Officials said the blockage followed a landslide triggered by road-cutting work on the Naga-Tosa Road. The incident occurred near the confluence of the two rivers during the night of September 5 and 6. After the clearance operation, both rivers resumed normal water flow. Meanwhile, disaster management teams continue to monitor river levels and slope stability in the affected area.
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Key Facts
- Location: Mangan district, Sikkim
- Rivers affected: Teesta and Chyakoong
- Incident: Landslide and river-channel blockage
- Date: Night of September 5–6
- Cause: Landslide linked to road-cutting work on Naga-Tosa Road
- Nearby landmark: Theng Tunnel
- Tunnel length: 578 metres
- Monitoring teams: Chungthang Police and District Disaster Management Authority
- Current status: River flow normal; situation stable
Landslide Blocked River Channels
The landslide occurred near the confluence of the Teesta and Chyakoong rivers in a forested area opposite the 578-metre-long Theng Tunnel on the Chungthang-Mangan highway.
According to officials, debris from the landslide restricted the natural flow of both rivers. As a result, authorities faced a potential risk of sudden water release and a flash flood downstream.
Following the incident, the Mangan district administration immediately conducted an on-site assessment.
Debris Cleared, Water Flow Restored
Officials cleared the debris blocking the natural river channels. Consequently, water has returned to a normal flow rate, significantly reducing the possibility of a sudden surge downstream.
The administration said the affected stretch of the rivers remains stable. However, authorities continue to monitor the area because unstable slopes could pose additional risks.
Round-the-Clock Monitoring Underway
Personnel from Chungthang Police and the District Disaster Management Authority remain deployed at the site.
The teams are monitoring river levels and checking slope stability around the affected area. Moreover, the district administration is keeping a close watch on the situation and will issue further updates if necessary.
Advisory for Residents
Despite the improved situation, authorities have advised residents living along the downstream Teesta river belt to remain alert.
Residents should avoid approaching riverbanks and should follow official safety instructions. As a precaution, the administration has also advised people to voluntarily move to safer and higher locations until clearance operations are fully completed.
The administration continues to assess the situation to prevent any further threat from the landslide or changing river conditions.
Q&A
What happened in Mangan district?
A landslide blocked the natural channels of the Teesta and Chyakoong rivers, creating a potential flash flood risk.
When did the landslide occur?
The landslide occurred during the intervening night of September 5 and 6.
What caused the river blockage?
Officials linked the landslide to road-cutting work on the Naga-Tosa Road.
Has the flash flood threat been reduced?
Yes. Authorities cleared the debris and restored normal river flow, significantly reducing the risk of a sudden downstream surge.
Are authorities still monitoring the area?
Yes. Chungthang Police and disaster management personnel continue round-the-clock monitoring.
Location Context
Mangan is a strategically important and mountainous district in North Sikkim, where steep slopes, landslides and heavy rainfall can affect rivers and road connectivity. Therefore, continuous monitoring remains important for communities living along the Teesta river belt.
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