Quick Answer: Dehradun to Gangotri by taxi covers approximately 290-300 km via Rishikesh, Tehri and Uttarkashi, taking around 10-11 hours. The road is motorable directly to Gangotri temple; only the further trip to Gaumukh glacier (19 km) requires a trek. Call +91-7830211223 for current fares.
Gangotri is a town and a Nagar Panchayat (municipality) in Uttarkashi district in the state of Uttarakhand, India. It is a Hindu pilgrim town on the banks of the river Bhagirathi and the earthly origin point of the River Ganges. It sits on the Greater Himalayan Range, at a height of around 3,100m.
Gangotri, the origin of the River Ganges and seat of the goddess Ganga, is one of the four sites in the Chota Char Dham pilgrimage circuit. The present Gangotri Temple was built in the 18th century by the Gorkha general Amar Singh Thapa and later restored in the early 20th century by Maharaja Madho Singh II of Jaipur. The river is called Bhagirathi at the source and acquires the name Ganga (the Ganges) only from Devprayag onwards, where it meets the Alaknanda. The true origin of the holy river is at Gaumukh, set in the Gangotri Glacier, a 19 km trek from Gangotri town.
"Gangotri is a town and a Nagar Panchayat (municipality) in Uttarkashi district in the state of Uttarakhand, India. It is a Hindu pilgrim town on the banks of the river Bhagirathi and origin of River Ganges."