SR 307 was original certified in 1933, it was routed between Madison and SR 45 along current State Route 84. In 1934 SR 307 swapped alignments with SR 84.
In 1933, SR 307 was first certified and traveled between Madison and SR 45 via the current State Route 84. By 1934, the route of SR 307 had been realigned to coincide with that of SR 84.