As of 4pm of November 11, floods had claimed five lives and injured three people while three others remained unaccounted for.
About 160 houses were damaged in the districts of Phu Yen, Van Ho, Muong La, Moc Chau and Bac Yen.
Floods also wreaked havoc on more than 180ha of rice, 48ha of other crops and hundreds of livestock and poultry in Son La.
Roads to six communes of Phu Yen district along with two bridges in Gia Phu commune of this district were ruined.
Floodwater completely isolated six communes of Van Ho district, namely Chieng Yen, Suoi Bang, Lien Hoa, Muong Men, Song Khua and Muong Te. It also inundated some sections of National Highways 37 and 43 and left the 35kV power system in Phu Yen and Bac Yen districts out of order.
It is forecast that heavy rains measured at around 100mm will continue in areas from Son La southward to the central province Nghe An until October 12 noon.