 In 1941, SR 338 swapped alignments with SR 124 from to east of Racine; SR 338 was given the southern alignment along the Ohio River.By 2003, SR 338 was truncated at the new alignment of US 33 approximately east of Racine; the former alignment of SR 338 from Racine south along the river and back up north to east of Racine designated as SR 124; from east of Racine to US 33 decertified.When SR 338 was truncated in 2003, the remains of the highway became known as SR 338-J.