Authorities said landslides and mud had blocked sections of National Highway 6 and several provincial roads in Dien Bien on July 6, leaving multiple routes impassable.
Road maintenance crews had cleared most affected sections by mid afternoon, restoring traffic on many roads. However, the Huoi So-Huoi Long and Deo Gio-Ta Sin Thang routes remained closed as workers continued removing large volumes of debris.
According to the Dien Bien hydrometeorological agency, heavy to very heavy rain fell across the province from the night of July 5 to the morning of July 6, with some areas recording more than 100 mm of rainfall.
Neighbouring Lai Chau also experienced widespread flooding and landslides after receiving between 100 mm and 200 mm of rain from July 5 to July 6.
Floodwaters inundated roads leading to Muong Than Village, forcing vehicles to take alternative routes, while part of an irrigation canal in Muong Cang Village collapsed, raising concerns over further landslides if the rain continues. Damage to transport and irrigation infrastructure has been estimated at around VND 220 million (approximately USD 8,400).
Twelve landslides were also reported along National Highways 12 and 4H, which link Lai Chau and Dien Bien, depositing nearly 3,000 cubic metres of earth and rock and causing major traffic disruptions.
Rain continued across both provinces on July 6, with authorities warning of a high risk of flash floods, landslides and localised flooding. Local officials and emergency teams are monitoring vulnerable areas, clearing damaged roads and urging residents to avoid travelling through landslide prone zones.
