Barak Bridge that connects Manipur with other states of India collapsed on Monday morning, said State transport dept. official.
The bridge collapsed after NH-102 faced a major landslide at Viswema in neighbouring Nagaland.
The incident has left over 200 goods-laden trucks stranded on the highway. The repairing work on the bridge has been started.
The Barak Bridge is located along the Imphal-Jiribam highway and passes through the hill district of Tamenglong.
The highway, considered as the second lifeline of the border state, assumed greater importance after a massive landslide at Viswema in neighbouring Nagaland cut off the major Imphal-Dimapur national highway.