The Son La People's Committee said heavy rain and flooding between July 4 and 6, caused by Tropical Storm Wipha and its aftermath, severely damaged the province's road network.
More than 400 landslides, embankment collapses, road subsidence and drainage blockages were recorded along national and provincial highways, causing dozens of traffic disruptions and increasing the risk to motorists.
Authorities ordered emergency measures, including traffic diversions and road repairs, while deploying personnel and equipment to restore transport links.
Landslide risks will continue to be monitored, with damage assessments and emergency construction carried out where necessary.
Since July 4, the disaster has affected nearly 100 homes and several schools and public facilities. More than 30 households have been evacuated.
Flooding and landslides also damaged more than 160 hectares of rice fields and 45 hectares of other crops, while power outages disrupted electricity supplies to more than 4,200 customers.