Les 3 Vallées · France
Bosses
Double black (expert)Grooming: backcountry
52
Very good
458 m
Length
133 m
Vertical drop
2220 m
Starts at
2087 m
Ends at
28%
Avg gradient
47.2%
Max gradient
sustained 50 m
Elevation profile
Run analysis
Bosses is a double black (expert) run at Les 3 Vallées measuring 458 m, dropping 133 m from 2220 m down to 2087 m. It averages a 28% gradient, steepening to around 47.2% at its most sustained pitch.
Snowboard-friendly: no significant flat or uphill sections detected along the descent.
Bonvo Slope Score: 52/100 — Very good
Vertical4/30
Length2/25
Gradient character25/25
Flow20/20
Scored from the run's real geometry — steepness is judged against what a double black (expert) run should feel like, so every difficulty class can reach 100. Methodology
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