I’ve covered the part of the Isère where most of my Tours either start or get a stage in.
For my Tour of 2024, I dedicated part of a post to the “Grenoble area” describing the options I had for my Prologue.
In the end, I started in Chambéry because our stopover for the night moved there after the one in Grenoble got cancelled.
The valley between Grenoble and Albertville is called the “Haute-Grésivaudan” the upper valley, the part between Tullins and Grenoble the “Bas-Grésivaudan” or lower valley.
Roughly half of the upper valley is in the Isère, the other half is in the Savoie.
On the west side of the valley are the Chartreuse Mountains, on the east side the Belledonne Montains; from the Combe the Savoie (near Montmélian), the ranges are the Bauges and the Beaufortain respectively.
(Note that the valley is often mentioned as running between Grenoble and Chambéry, but that refers to only the Chartreuse Mountain range in the west.)
The valley is riddled with climbs, mostly dead ends, steep and (part) gravel or dirt.
The ones I listed in my 2024 post are all in the Haute-Grésivaudan.
There are but a few climbs between Tullins and Grenoble, which I will most likely never cycle, but they are listed anyway.
I’ve also included a few cols that are in the Chambéry region, even if that – geographically – doesn’t belong to the valley…
Map with cyclable cols in the Grésivaudan Valley:
Background for this page by Remontees, CC BY-SA 4.0, via Wikimedia Commons
As is customary after all my cycling trips into the high mountains, most of those shamelessly dubbed 
