Following the closure of the Tunnel du Chambon (on the route from Bourg d’Oisans to Briancon via the Col du Lautaret and on to the Col du Galibier) in April, when large cracks were found suggesting a likely collapse, there will now be a re-route of July’s La Marmotte
The organisers of the event have been in lengthy discussion with local authorities to find a new route which is yet to be finalised but could look something like this:
Usual start in Bourg d’Oisans, Col du Glandon, Col de Chaussy, down via the Lacets de Montvernier, and climb back up over the Col de la Croix de Fer, with the usual finish on to l’Alpe d’Huez.
As our friends at La Marmotte work hard to confirm the new route we will keep you posted.

La Marmotte
.
Not happy La Marmotte will not be la Marmotte this year. No Galibier! Wish I’d been told before i paid for the entry.
Mark, I too am very miffed but the problem wasn’t known when we all registered, however the organisers should give us the option of a refund and or entry to next year’s event over the route I want to ride.
http://ridewithgps.com/routes/7997305
So is this a correct interpretation of your description?