Its tehri dam . It is in uttharkand
on the Bhagirathi River near Tehri in Uttarakhand, India. hope its the best answer
The Tehri Dam is the tallest dam in India and one of the tallest in the world. It is a multi-purpose rock and earth-fill embankment dam on the Bhagirathi River near Tehri in Uttarakhand, India. It is the primary dam of the THDC India Ltd. and the Tehri hydroelectric complex. Phase 1 was completed in 2006, the Tehri Dam withholds a reservoir for irrigation, municipal water supply and the generation of 1,000 megawatts (1,300,000 hp) of hydroelectricity. The dam's 1,000 MW pumped-storage scheme is

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It is located in Uttarakhand.It is the tallest dam in India..
Hope it helps and pls mark it as the best answer :-)