The rituals were conducted by priests Aditya Vashisth and Parikshit Sikhola as the urns containing the ashes of General Rawat and his wife were emptied into the holy river by their daughters, Tarini and Kritika, amid full military honours.
Uttarakhand Chief Minister Pushkar Singh Dhami met the two sisters at the VIP ghat.
He said General Rawat will forever remain lodged in people's memory.
India's first Chief of Defence Staff (CDS) General Rawat and his wife Madhulika were killed, along with 11 others, in a tragic helicopter crash near Coonoor in Tamil Nadu on December 8.
General Rawat hailed from Saina village in Uttarakhand's Pauri district.