We hope that your experience, whatever your practice, is most successful, but in the field we do not always control everything... So our mission is to keep you informed!
Here is all the "Ongoing field information" you need to know before you leave.
Chartreuse sector
Outside the PDIPR network of the Pays Voironnais, access to the Grande Sure via the passage of the Not of Mercy is prohibited by municipal decreeIndeed, a geotechnical study carried out in 2010 had detected significant unstable rock masses with a very high risk of failureA recent rockfall in September 2025 served as a stark reminder of the danger of this route. We recommend using the Grapillons route described in the guidebook. The Grande Sure mountain pasture – OT Pays Voironnais.
Valdaine Sector
Good news The following circuits, impacted by the dismantling of a footbridge, are once again accessible with a slight detour. Download GPX files update !
- Mountain biking route #31 The Marshes of the Val d'Ainan
- Mountain bike route #32 At the gateway to the Chartreuse mountains
- Mountain biking route #33 From marsh to castle
- Mountain bike trail #35 Saint Sixte le lac
- Mountain bike #92 Valdolac
- TRAIL #51 Discovering trail running
- TRAIL #52 Barracuchet Loop
report a problem
Are you encountering a problem on a trail (missing markers, a tree across the path, etc.)? Please let us know:
- thanks to the app "Suricate", you can report the problem encountered without delay and geolocate it
- by our contact formWe will need to be as precise as possible about the location to allow us to launch an intervention.
Let's not forget
Good reflexes
For a 100% successful outing 😉