According to the latest media reports, inflows in Prakasam barrage have reached a record million cusecs and weakening embankments at particular points along the river course threaten to inundate vast areas.
Even though Irrigation officials believe that the barrage faces no threat, the barrage has never faced such massive inflows in its history.
State authorities have mobilised 300,000 sand bags to stop flooding, while efforts are still on to evacuate thousands of people.
"There is three to four feet water in some areas along the river in Vijayawada city and this may go up to six to seven feet later in the day. We have already moved out of the area near the river," Suresh Kumar, a resident was quoted as saying in a news agency report.
Villages adjourning Vijayawada have come under water and about 40,000 people from these villages have been shifted to relief camps.