Iron Creek Twistys

Iron Creek Twistys in Custer, South Dakota is graded at 123 corners, about 13.1 for every mile you drive. 32 of them are genuinely tight (26% of the road), and the sharpest turns in at a 14 m radius.

Graded corners

123

Tight (1–2)

32

Tightest radius

14 m

Corners per mile

13.1

Corners are graded from the route’s own geometry on the rally 1–6 scale, where 1 is a hairpin. Road & Rally calls them out as you drive.