As part of the 1962 Route Reclassification Act, Great Hill Road in Ansonia and Seymour was taken over by the state and designated as SR 734. With the opening of the Route 8 expressway, the old surface alignment of Route 8 in Derby and Seymour was designated as SR 735 in 1960. In the 1962 Route Reclassification, most of this had been turned over to the towns. SR 735 was reconfigured to instead follow Franklin Street towards downtown Ansonia instead. Route 334 was commissioned1963 from SR 734 and the reconfigured SR 735 and has had no significant changes since.