The Atal Rohtang Tunnel's foundation stone, laid by Sonia Gandhi in June 2010 has apparently disappeared mysteriously.
Thakur won from Seraj constituency by defeating Chet Ram of the Congress.
The Congress is doing better than expected in Gujarat, given that it had won 61 seats in the 2012 elections while the BJP had got 115.
As many as 7,525 polling booths have been set up in the state and 37,605 polling personnel have been deputed for poll duty.
Dhumal, a two-time chief minister, will contest from Sujanpur instead of Hamirpur, which he represents in the outgoing assembly.
Koskar is the only panchayat in the state whose entire population migrates to comparatively warmer places such as Kullu for three to four months every winter.