Distance
23 mi
Duration
40m
Checkpoints
2
Road type
Mountain twisty
Region
Southeast
Length
Medium (20-50 miles)
Surface
Paved - modern
Intensity
Technical
Season
Fall
Winter status
Sometimes closed
About
US 421 over Holston and Iron Mountain between Bristol and Mountain City — 489 curves and three mountains, and the reason Shady Valley has a motorcycle shop and not much else. Tight, steep and relentless; the middle section rarely lets you out of second and third. Photo: Brian Stansberry / CC BY 3.0, via Wikimedia Commons.
The road
The Snake (US 421) in Shady Valley, Southeast is graded at 285 corners, about 12.4 for every mile you drive. 90 of them are genuinely tight (32% of the road), and the sharpest turns in at a 12 m radius.
- Graded corners
- 285
- Tight (1–2)
- 90
- Tightest radius
- 12 m
- Corners per mile
- 12.4
Corners are graded from the road’s own geometry on the rally 1–6 scale, where 1 is a hairpin. Road & Rally calls them out as you drive.
Checkpoints
2
Checkpoints · Members only
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Fastest times
No one has a time on this road yet. Drive it start to finish in the Road & Rally app and the first run sets the record.
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