Route 85 ends in Bolton at US 6 and US 44 with a partial interchange with I-384 just before its terminus.

[1] The section of Route 85 south of Colchester can be traced to the 19th century Hartford and New London Turnpike (also called Governor's Road)[1] This portion of the former turnpike was designated as State Highway 102 in 1922, when state highways were first signed in Connecticut.

The northward continuation from Colchester to Hebron was assigned as State Highway 366.

Modern Route 85 was established in the 1932 state highway renumbering from old Highways 102 and 366, with an extension north via Bolton center to Route 83 in Manchester (using Campmeeting Road and Charter Oak Street).

[4] Media related to Connecticut Route 85 at Wikimedia Commons