A 2.03-mile (3.27 km) section in Redding, running from the Weston town line to the beginning of a brief concurrency with Route 107, is a designated state scenic road.

[2] The main road connecting the city of Norwalk to the borough of Newtown was organized as a private turnpike in May 1829.

In 1922, part of the Norwalk and Danbury Turnpike between West Redding and Bethel was given the designation State Highway 180 while part of the Newtown Turnpike between Redding Ridge and Newtown was assigned as State Highway 158.

Route 57 took over the former Georgetown Road segment and the Newtown Turnpike became unsigned SR 725.

In 1963, the southern part was relocated onto the Newtown Turnpike (former SR 725) to Weston Center, then shifted to the alignment of former Route 103 (Chestnut Hill Road/East Avenue) via Cedar Road/Norfield Road (former SR 741).