The highway has been closed near Vishnuprayag, one of the five confluences of Alaknanda river, between Joshimath (also known as Jyotirmath) and Badrinath, the famous pilgrim spot in the hill state.
In the afternoon, landslides occurred here after huge boulders rolled down the Hathi Pahar mountain. The area between the highway and Alaknanda river was filled with debris.
District Magistrate Ashish Joshi told PTI that BRO (Border Roads Organisation) personnel are engaged in clearing the roads and it could be opened for the traffic by the afternoon tomorrow.
The pilgrims have been asked to stay at these places till the way is cleared.
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Keeping in view the danger posed by intermittent fall of debris from the mountain, the district administration has arranged for safety of travellers at convenient places in advance, Joshi said.
However, witnesses said that huge rocks from Hathi Pahar have fallen over the road and it could take a long time to get the way cleared.
Due to the closure, pilgrims on way to Badrinath have temporarily stopped at Joshimath, Pipalkoti and Karnaprayag, and are waiting for the way to get cleared.