 By the end of November 1959, the new interstate extended around the north side of Des Moines to US 69.Within a year, the East Mixmaster, where I-35 splits away to the north, was opened.By the end of 1960, from US 71 north of Atlantic to US 6 near Dexter, from I-35 to US 6 west of Newton, and from Iowa 38 near the Cedar River to US 61 in Davenport had opened to traffic.