 East of the 86th Street exit , the freeway begins a slow descent towards the Des Moines River . Merle Hay Road , named for the first Iowan to die in World War I , carries Iowa 28 from the south to its northern end at the interstates . They cross the Des Moines River just south of the mouth of Beaver Creek . Four miles ( 6 km ) to the east is Iowa 415 and one mile ( 2 km ) further east is US 69 . Between the interchanges there is a fourth lane in each direction . At the end of their 14 miles ( 23 km ) together , I @-@ 35 exits to the north and I @-@ 235 's eastern end is to the south at the East Mixmaster . 
