Arunachal Pradesh chief minister Nabam Tuki said on Saturday he would ask the central government to look into China constructing three hydropower projects on the Brahmaputra river in Tibet.
"China building the three dams will affect the interest of people in the downstream areas. We will soon move New Delhi to take up this issue with China in the interest of the people," Tuki said.
He added: "It is a cause of concern for us but we are not certain how big these dams are..."
The 2,906-km-long Brahmaputra - called Tsangpo in Tibet - is one of Asia's longest rivers that traverses 1,625 km through Tibet, 918 km in India and 363 km in Bangladesh before flowing into the Bay of Bengal.
China's plan to build the dams over the Brahmaputra river and diverting water into its arid provinces has been opposed by state governments in India's northeast.
Assam chief minister Tarun Gogoi had written to Prime Minister Manmohan Singh requesting him to take up the matter regarding the construction of the three dams on the Brahmaputra with Beijing.
"We can't do anything if China is building dams. Our concern is that the lives of the people in the downstream should not be affected by the dams," Tuki said.
China announced plans to build three dams - Dagu, Jiacha and Jiexu - on the river last month as part of its aggressive plan to provide energy and water needs for its 1.3 billion people.
The Chinese government said that the hydropower dams would not impact flood control efforts or the ecological environment in downstream regions.
Experts said that if the projects were carried out, they would have devastating consequences on the lives of millions of people in India and Bangladesh.
Agriculture forms the backbone of the economy in both Assam and Arunachal Pradesh with nearly 80 percent of the 27 million people in the two states eking out a living through farming, an agriculture scientist said.
India and China do not have a water-sharing agreement. However, both countries have instituted a working group mechanism to exchange data, including measurement of water flow from rivers.