Le Grand Bornand · France
Couloir de la Sonnerie
Excellent
Elevation profile
Run analysis
Couloir de la Sonnerie is a black (advanced) run at Le Grand Bornand measuring 1.1 km, dropping 347 m from 1772 m down to 1424 m. It averages a 30.1% gradient, steepening to around 71% at its most sustained pitch.
Snowboard-friendly: no significant flat or uphill sections detected along the descent.
Watch for an uphill section: 25 m of climb about 1.1 km in.
Bonvo Slope Score: 58/100 — Excellent
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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