Les 3 Vallées · France
Grand Couloir
Black (advanced)Grooming: backcountry
59
Excellent
729 m
Length
314 m
Vertical drop
2698 m
Starts at
2384 m
Ends at
41.8%
Avg gradient
85.7%
Max gradient
sustained 50 m
Elevation profile
Run analysis
Grand Couloir is a black (advanced) run at Les 3 Vallées measuring 729 m, dropping 314 m from 2698 m down to 2384 m. It averages a 41.8% gradient, steepening to around 85.7% at its most sustained pitch.
Snowboard-friendly: no significant flat or uphill sections detected along the descent.
Bonvo Slope Score: 59/100 — Excellent
Vertical10/30
Length4/25
Gradient character25/25
Flow20/20
Scored from the run's real geometry — steepness is judged against what a black (advanced) run should feel like, so every difficulty class can reach 100. Methodology
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