Connecticut Route 12
# Connecticut Route 12

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.

## Junction list

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