The river, one of Asia’s largest that originates in the Tibet region and flows about 560 miles through Assam, flooded villages, swept away homes and forced nearly 300,000 people into government-run relief camps, officials said.
Authorities provided food and relief supplies to flood victims including airdrops from helicopters, Assam chief minister Himanta Biswa Sarma said.
Nearly 900 villages were submerged and more than 7,000 homes were without electricity, he said.
Police, disaster response teams and local volunteers were working to rescue stranded residents and deliver essential supplies to flood-hit communities, officials said.
Jatin Gogoi, a 52-year-old farmer from Nazira, said the rising waters swept away his bamboo-walled home and destroyed his livelihood.
“I lost all my cattle. My five-member family and I have nowhere to go, so we are taking shelter in a relative’s home,” he said.
Flooding on Thursday evening disrupted parts of Guwahati, Assam’s capital with about two million residents, as submerged roads left commuters stranded for hours.
“I had to stay overnight at my office. The roads were filled with water, some waist deep,” said Sudip Mazumdar, a journalist in Guwahati.
Experts say human-caused climate change is intensifying South Asia’s monsoons, which traditionally run from June to September and again from October to December.