The meeting was earlier this month, but the document is online. This meeting was for that portion of 20 to be four-laned from the west side of Correctionville and relocated IA 31 to L25. On the map, you can see that the east end has a median barrier and expands after crossing the Little Sioux River. For about half the distance, the new eastbound and westbound lanes will be on either side of the existing roadway (which will be removed). Then, the new grade will be just north, but looks like it’s slightly straighter than the existing one. Insets show there will be some leveling off of surrounding land and the entire highway will be at a higher elevation.
Traffic will be detoured onto old 20 (D22), which Woodbury County will be repaving next year in preparation for the closure of current 20.