Connecticut Route 12

Route 12
Route 12
	Map of eastern Connecticut with Route 12 highlighted in red
Route information
	Maintained by CTDOT
Length	54.46 mi (87.64 km)
Existed	1922–present
Major junctions
South end	US 1 in Groton
	I-95 / Route 184 in Groton; Route 2A in Preston; Route 2 in Norwich; I-395 in Lisbon; Route 14 in Central Village; US 6 in Danielson; Route 101 in Dayville; US 44 in Putnam;
North end	Route 12 at Dudley, MA
Location
Country	United States
State	Connecticut
Counties	New London, Windham
Highway system
	Connecticut State Highway System; Interstate; US; State SSR; SR; ; Scenic;

Connecticut Route 12 is a state highway that runs between Groton and the state line in Thompson.

History

Route 12 was preceded by New England Interstate Route 12. The southern terminus of NE-12 was originally at New London, Connecticut. It travelled along present-day Route 32 (along the west bank of the Thames River) from New London to Norwich, Connecticut. In 1932, when Connecticut decommissioned its New England Routes, Route 12 swapped places with Route 32 south of Norwich. From Norwich to the Massachusetts border, Route 12 still follows its 1920s alignment.

Route description

Route 12 from Groton to Norwich is a primary route, serving the Naval Submarine Base New London and is known as the U.S. Submarine Veterans Memorial Highway. North of Norwich, Route 12 is a minor road closely paralleling Interstate 395. Route 12 goes through the following towns: Groton, Ledyard, Preston, Norwich, Lisbon, Griswold, Canterbury (0.14 miles only), Plainfield, Killingly, Putnam, and Thompson.

Route 12 in Groton near its southern end

Junction list

County	Location	mi	km	Destinations	Notes
New London	Groton	0.0	0.0	US 1 south – Downtown Groton
		0.11	0.18	I-95 – New London, Providence	Exit 85 (I-95)
		0.22	0.35	Route 184 east – Center Groton, Ledyard
	Ledyard	6.86	11.04	Route 214 east – Ledyard
	Preston	9.08	14.61	Route 2A west to I-395 / Conn. Turnpike – Uncasville	Western terminus of CT 2A overlap
	Preston	9.38	15.10	Route 2A east – Hallville	Eastern terminus of CT 2A overlap
	Norwich	12.12	19.51	Route 2 west to Route 32 – Hartford	Western terminus of CT 2 overlap
		12.43	20.00	Route 2 east – Stonington	Eastern terminus of CT 2 overlap
		15.19	24.45	Route 97 north – Taftville
	Lisbon	19.62	31.58	I-395 / Conn. Turnpike – Worcester, New Haven	Exits 21A–B (I-395/Connecticut Turnpike)
	Lisbon	20.43	32.88	Route 138 west – Newent	Western terminus of CT 138 overlap
	Griswold	20.82	33.51	Route 138 east – Pachaug	Eastern terminus of CT 138 overlap
	Griswold	21.05	33.88	Route 201 south – Hopeville Pond State Park
Windham	Plainfield	27.50	44.26	Route 14A west – Plainfield, Canterbury	Western terminus of CT 14A overlap
		27.91	44.92	Route 14A east to I-395 / Conn. Turnpike – Sterling
		30.31	48.78	Route 14 east to I-395 / Conn. Turnpike – Moosup	Eastern terminus of CT 14 overlap
		30.59	49.23	Route 14 west – Canterbury	Western terminus of CT 14 overlap
		32.12	51.69	Route 205 north – Wauregan, Brooklyn
	Killingly	36.15	58.18	US 6 east to I-395 – Providence	Eastern terminus of US 6 overlap
		36.51	58.76	US 6 west – Hartford	Western terminus of US 6 overlap
		39.46	63.50	Route 101 to I-395 – Dayville, East Killingly
		42.04	67.66	Route 21 north – Putnam Heights
	Putnam	45.58	73.35	US 44 west – Pomfret	Western terminus of US 44 overlap
		46.02	74.06	Route 171 west – Woodstock
		46.22	74.38	US 44 east to I-395 – East Putnam	Eastern terminus of US 44 overlap
	Thompson	48.17	77.52	Route 193 north – Webster, MA
		48.88	78.66	I-395 south – Norwich, New Haven	Exit 49 (I-395); partial interchange
		49.88	80.27	Route 200 east – Thompson
		51.95	83.61	Route 131 west – Quinebaug, Southbridge, MA
		54.46	87.64	Route 12 north – Auburn, Worcester	Continues into Webster as MA 12
1.000 mi = 1.609 km; 1.000 km = 0.621 mi