Brévent/Flégère (Chamonix) · France
François Bonlieu
Black (advanced)Grooming: classic
65
Excellent
1.2 km
Length
412 m
Vertical drop
2395 m
Starts at
1983 m
Ends at
34.4%
Avg gradient
73.3%
Max gradient
sustained 50 m
Elevation profile
Run analysis
François Bonlieu is a black (advanced) run at Brévent/Flégère (Chamonix) measuring 1.2 km, dropping 412 m from 2395 m down to 1983 m. It averages a 34.4% gradient, steepening to around 73.3% at its most sustained pitch.
Snowboard-friendly: no significant flat or uphill sections detected along the descent.
Bonvo Slope Score: 65/100 — Excellent
Vertical14/30
Length6/25
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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