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Postville and the Yellow River

Postville and the Yellow River is 41.9 miles of loop riding through Allamakee and Clayton Counties in Iowa — Driftless Iowa, the Upper Iowa, the Yellow River country and the climbs out of the Mississippi. Moving time is about 56 minutes; allow 80 with stops — a half morning. It is scored CS-2, Easy: 49 corners, 101° of turning per mile, 1,523 feet of climbing. The roads it uses, in the order you ride them, are in the app.

Curviness
CS-2Easy · 1.17/mi
Distance
41.9 mi56 min riding
Corners
4949% sharp · Tight
Climbing
1,523 ft37 ft/mi · Rolling
Shape
LoopHalf morning
Roads
Backroads64% county & local
Traffic
—no published counts
Speed limit
55 mphtypically 55
Open this route in the app

How it rides

49 corners over 41.9 miles — 1.17 a mile, and 101° of turning for every mile ridden. That scores CS-2, Easy on the five-point curviness scale. 49% of those corners are sharp ones, and the road reads as tight.

What it climbs

The road climbs 1,523 feet in total, 37 feet per mile, between 949 and 1,249 feet — 300 feet of relief. The longest single climb is 242 feet over 2.4 miles, and the steepest grade on it is 7.1%. By Driftless standards that is rolling.

Surface, speed and traffic

91.4% paved — the rest is gravel or seal coat, so check the surface before you commit. 64% of it is back road rather than highway, the other 36% state or US route. Posted speeds run to 55 mph, typically 55, measured across 26% of the route. No published traffic counts cover this route, so it carries no traffic figure rather than a borrowed one.

Worth knowing

Turn-by-turn directions and the spoken notes along the way are in the app. Every figure on this page is measured from the route itself — corner counts and gradients from the road geometry, elevation from the national elevation dataset, traffic from the state transport departments where counts exist.

Nearby roads