Road to Briancon/Lauteret blocked

The road to Briancon, Col du Lauteret, Galibier will be closed until at least June just after the turnoff to les 2 alpes coming from Grenoble. This is due to land movements around the Chambon tunnel which have caused part of the roof to collapse. This could impact the Marmotte if they are unable to stabilize the terrain by the start of summer.
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2012 Colnago CX-1
2015 Colnago AC-R
Exeter Wheelers
There's also the small matter of the Tour later in July!
I suppose if the worst came to the worst, they could reroute both Tour and Marmotte over the Croix de Fer (possibly via Mollard) and then back down Glandon to Bourg d'Oisans. Wouldn't be quite the same though.
Cheers for the info though.
If it is not fixed by then you may be ok as there is a ferry boat service in place on the lake. Some people have also taken the path that runs above the tunnel (check on an IGN map)... although not ideal on a road bike.
http://app.strava.com/athletes/1078863
http://app.strava.com/athletes/1078863
wow
so the Marmotte will have to change route as well
thanks again for the update