The Darma, Vyas and Chaudas valleys were cut off from the rest of the border districts on Thursday after a 48-metre-long concrete bridge was washed away following heavy rains.
The bridge was built over the Kulagar rivulet on the Tanakpur-Tawaghat national highway, close to the Indo-China border, district official AK Shukla said.
A trek route has been developed as a substitute by the Border Roads Organisation (BRO) for the time being, he said.
Transshipment is being done along a 100-metre area to reach either side of the breached road, Mr Shukla said.
The BRO has said a Bailey bridge will be built as an alternative within five days to resume vehicular movement to the border valleys, he added.
Border Roads Organisation Invites Applications For 466 Positions, Details Here 70 Rescued After Heavy Snowfall In Arunachal Pradesh Border Roads Organisation To Fence Major Portion Of India-Myanmar Border: Top Official This Trump Pick Might Spell Trouble For Indian Techies, H-1B Visa Seekers Construction Halted, Buses Restricted: Stricter Anti-Pollution Measures In Delhi GRAP 3 In Delhi Explained: What Is Banned, What Is Allowed Karnataka Forms Special Team To Probe 'Covid Scam' During BJP Rule "At 500+ AQI...": Ixigo CEO Slams Delhi People For Not Wearing Masks Former Samajwadi Party MLA Irfan Solanki Granted Bail In Arson Case Track Latest News Live on NDTV.com and get news updates from India and around the world.