 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.The VT 17 designation was extended eastward through Chittenden County and along the McCullough State Highway at this time.VT 17's connection to the state of New York was temporarily severed in October 2009 when the Champlain Bridge was closed due to safety concerns.