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1931 – Original route established; originally routed from 2 miles (3.2 km) south of Bay View (about 6 miles (9.7 km) west of Sandusky) to Bayview.
1937 – Extended to its current southern terminus along a previously unnumbered road from 2 miles (3.2 km) south of Bay View to Bellevue, and along a previous alignment of State Route 296 from Bellevue to 7 miles (11 km) south of Bellevue.
1969 – Extended to its current northern terminus along State Route 2’s alignment from Bay View to Danbury (about 5 miles (8.0 km) west-southwest of Marblehead) and along the alignment of former State Route 240 from Danbury to the current northern terminus.
1989 – Routed with the State Route 2 freeway across Sandusky Bay from just south of Bay View to just north of Danbury; a short time later, the old Bay Bridge was demolished.