After the long straightaway, the highway turns to the northeast towards Fontanelle and then curves to the east-northeast to Greenfield and an intersection with Iowa 25. East of Greenfield, the highway follows a stair-step pattern, an easterly straightaway followed by a short curve to the north and then back to the east, for nearly  until it reaches US 169 on the western outskirts of Winterset.
After the long straight section, the highway turns northeast towards Fontanelle and then curves eastward-northeast toward Greenfield and intersects with Iowa 25. East of Greenfield, the road follows a stair-step pattern: an eastbound stretch followed by a short curve to the north and then back east until it reaches US 169 on the western edge of Winterset.