 In 1958, the route north of Watervliet to the county line was realigned, smoothing several sharp curves.The construction of the I-196/US 31 freeway around the South Haven area impacted the northern terminus of M-140 in the 1960s.When it opened in 1963, BL I-196 was shown on maps as continuing north along M-140 into town to a junction with M-43.