Alyeska Resort · United States
Surprise Gully
Black (advanced)
49
Very good
240 m
Length
92 m
Vertical drop
691 m
Starts at
599 m
Ends at
36.7%
Avg gradient
45.6%
Max gradient
sustained 50 m
Elevation profile
Run analysis
Surprise Gully is a black (advanced) run at Alyeska Resort measuring 240 m, dropping 92 m from 691 m down to 599 m. It averages a 36.7% gradient, steepening to around 45.6% at its most sustained pitch.
Snowboard-friendly: no significant flat or uphill sections detected along the descent.
Bonvo Slope Score: 49/100 — Very good
Vertical3/30
Length1/25
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
Explore Surprise Gully on the map
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