In 1965, the state legislature authorized the extension of VT 17 from Bristol to the Addison–Chittenden county line, connecting it to the McCullough State Highway by way of Chittenden County's section of the former McCullough Turnpike.
In 1965, the Vermont state legislature approved extending VT 17 from Bristol to the border of Chittenden and Addison counties, connecting it to the McCullough State Highway through a section of the former McCullough Turnpike in Chittenden County.