Connecticut Route 171

Route 171
Map of northeastern Connecticut with Route 171 highlighted in red
Route information
Maintained by ConnDOT
Length:	20.70 mi (33.31 km)
Existed:	1959 – present
Major junctions
West end:	I-84 in Union
	Route 198 in Route 169 in
East end:	US 44 / Route 12 in Putnam
Location
Counties:	Tolland, Windham
Highway system
Routes in Connecticut Interstate U.S. State SSR SR ← Route 169 Route 172 →

Route 171 is a state highway in northeastern Connecticut, running from Union to Putnam.

Route 171 begins at an interchange from I-84 in northern Union (Also known as Mashapaug) and heads south to the town center, then east, south, and southeast into Eastford. It cuts across the northeast corner of Eastford into . In Woodstock, it heads southeast, then turns northeast, briefly overlapping Route 198 before continuing. It then passes Toutant Airport and turns east, briefly overlapping Route 169 before cutting across the southwest corner of Thompson into Putnam. In Putnam, it continues southeast before ending at an intersection with US 44 and Route 12.

The portion of modern Route 171 between South Woodstock and Woodstock Valley was part of an early toll road known as . This section of the turnpike became part of a state highway in 1922 with the designation Highway 183. Old Highway 183 continued south of Woodstock Valley to Eastford along modern Route 198. Between Putnam and South Woodstock, modern Route 171 was part of Highway 142, which continued north along modern Route 169 to North Woodstock and the Massachusetts state line. In Union, the Buckley Highway became Highway 149.

In the 1932 state highway renumbering, Route 91 was created from old Highway 183. It began further south than the old route at US 6 in Chaplin using modern Route 198 and extended further east to Route 12 in Putnam (along part of old Highway 142). At the same time, the Buckley Highway became part of Route 15 and Bigelow Hollow Road became Route 198.