From the north, starting at Saint-Michel-de-Maurienne, the climb is 11.8 kilometres (7.3 mi) long, gaining 856 metres (2,808 ft) in height (an average of 7.3%).
The maximum gradient is 9.8% at the summit.
On this side mountain pass cycling milestones are placed every kilometre.
They indicate the current height, the distance to the summit, the average slope in the following kilometre, and the number of the street.
As of July 2015, some milestones are missing in the middle part of the climb.

From the south, the climb starts at Valloire and is 4.8 kilometres (3.0 mi) long at an average gradient of 3.4% (height gain: 165 metres (541 ft)).
From the north, starting at Saint-Michel-de-Maurienne, the climb is 11.8 kilometres (7.3 mi) long, gaining 856 metres (2,808 ft) in height (an average of 7.3%). The maximum gradient is 9.8% at the summit. On this side mountain pass cycling milestones are placed every kilometre. They indicate the current height, the distance to the summit, the average slope in the following kilometre, and the number of the street. As of July 2015, some milestones are missing in the middle part of the climb.
From the south, the climb starts at Valloire and is 4.8 kilometres (3.0 mi) long at an average gradient of 3.4% (height gain: 165 metres (541 ft)).
Col du Télégraphe