From Champorcher, this road climbs continuously to a high valley of the Torrente Ayasse where there is an outcropping of several buildings called Dondenaz.
Initially, an asphalted road climbs along several switchbacks to the hamlets of Collin, Grande Mont Blanc, and Petit Mont Blanc in the first two miles. Shortly thereafter, the road base switches to dirt and this dirt road clings to the side of the mountain high above the Torrente Ayasse as it steadily climbs to Dondenaz.
There are a few short, steep sections of greater than 10% grade, but the main difficulty is the continuous nature of the climb along with the altitude. You'll have beautiful views to distract you from the climb though.
Shared By: Lost Justpastnowhere