Take into account that once in a year (on the 5th of August) the unpaved road is open to the cars on the occasion of the procession towards the Cuney Oratory.
Therefore one can take advantage of the opportunity and reach a fork near Ollière (2000 m); from here, instead of going left towards Cuney, continue straight arriving at the "Luca Reboulaz" Bivouac, near the Luseney lake (2574 m), in about an hour and a half.
A further map:
La Valpelline - escursioni
Istituto Geografico Centrale - 1:30000
The only comfortable spot to rest during a winter or summer ascent is bivacco luca reboulaz . This unwarded hut replaces the old bivouac "Franco Nebbiai", a little wooden structure which offered room for only 4 persons.
This hut asks a 3/4 hours walk from the hamlet of Praz, which belongs to the common of Lignan, within St Barthélémy. Left bank of Aosta valley, about 12 km east from Aosta, turning left once one reaches the village of Nus
Essential title : Alpi Pennine, vol.II, from the "Guida dei Monti d'Italia" series, published by CAI/TCI in 1970 (in italian)
The Swiss 1:50000 , sheet "Valpelline" map may be used, unless more accurate and detailed material may be found hereafter or in some good Aosta bookshop.