A full opening of the rebuilt interchange of I-35 and 1st Street in Ankeny has been delayed, KCCI reports. It was supposed to be this week. The news story in the second link has a guide through the interchange, which is the second diverging diamond in Iowa. In a diverging diamond, traffic temporarily shifts to the “wrong” side of the road to avoid left turns onto on-ramps.
This exit is the former west end of IA 931. There’s not much city to the east, but that’ll probably change soon.