The project, which threatens to submerge 118 villages and displace nearly five lakh people—mostly tribals—has long been a flashpoint between development promises and tribal rights.
According to the police, the boys were part of a group of 17 persons from Surat who were visiting the Poicha village to take a "holy bath" in the Narmada river.
Several areas in Gujarat were inundated due to heavy rains in the upper reaches of Narmada and the release of a massive amount of water from the Sardar Sarovar dam last week.
According to Manish Doshi, five districts are affected, and Gujarat Congress will write to the President of India, the Central Water Commission, and both the central and state governments about it.
At least one-and-a-half dozen trains, including Mumbai-Ahmedabad Tejas Express and Shatabdi Express, have been cancelled due to the flood, a Western Railway release said.