In 1961, the highway was realigned so that it no longer entered Sioux City; the segment from Smithland to Sioux City was designated (though not signed) as Iowa Highway 982.
In 1961, the highway was realigned so that it no longer entered Sioux City. The new segment went west from Smithland to Sloan, while the original segment from Smithland to Sioux City was designated (though not signed) as Iowa Highway 982.