Heavy rainfall in the catchment areas of neighbouring Arunachal Pradesh has caused river Jiadhol to rise and swamp fresh areas in the worst-hit Dhemaji district, official sources said.
More than 25 villages were flooded in the district affecting thousands of people who had been rendered homeless as flood waters had either entered their homes or damaged them.
Most of the roads were damaged or affected, while several others either partially or fully submerged, the sources said. Many road embankments had been eroded and approaches of bridge and culverts washed away by the flood water, it added.
The 11 affected districts are Dhemaji, Tinsukia, Chirang, Nagaon, Golaghat, Jorhat, Kamrup, Karimganj, Lakhimpur, Morigaon and Sibsagar.