The Three Gorges Dam is under watch after country lashed by weeks of heavy downpours.
The Three Gorges Dam in China is facing its biggest test since it opened almost 18 years ago.
Record-high river levels are expected on Thursday morning.
Southern China has been lashed by weeks of heavy downpours and dozens of people have died or are still missing as a result.
Al Jazeera’s Katrina Yu reports from Beijing, China.