 Five miles ( 8 km ) east of the speedway in an exit for Iowa 224 which connects to Kellogg . After this interchange , the highway curves to the northeast and descends a hill to cross the North Skunk River . Shortly after the river , it curves back to the east and climbs up the hill . As the road straightens out , it begins a 35 @-@ mile @-@ long ( 56 km ) stretch of straight higwhay . Between the river and the Iowa 146 exit south of Grinnell , the farmland that surrounds the interstate undulates . Just south of Malcom , it meets US 63 . Further east , at exit 201 for Iowa 21 , there are competing truck stops on either side of the freeway . A hotel is located on the northern side . 
