# Connecticut Route 12

Connecticut Route 12 is a state highway that runs from Groton north to the Massachusetts 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 north – Groton City | Continuation north; southern end of US 1 concurrency northbound |
| New London | Groton | 0.22 | 0.35 | I-95 south / US 1 south / Route 184 east – New London, Providence, Ledyard | Exit 86 on I-95; western terminus and exit 1 on Route 184; northern end of US 1 concurrency northbound |
| New London | Ledyard | 6.86 | 11.04 | Route 214 east – Ledyard | Western terminus of Route 214 |
| New London | Preston | 9.08 | 14.61 | Route 2A west to I-395 – Uncasville | Southern end of Route 2A concurrency |
| New London | Preston | 9.38 | 15.10 | Route 2A east – Hallville | Northern end of Route 2A concurrency |
| New London | Norwich | 12.12 | 19.51 | Route 2 west to Route 32 – Hartford | Southern end of Route 2 concurrency |
| New London | Norwich | 12.43 | 20.00 | Route 2 east – Stonington | Northern end of Route 2 concurrency |
| New London | Norwich | 15.19 | 24.45 | Route 97 north – Taftville | Southern terminus of Route 97 |
| New London | Lisbon | 19.62 | 31.58 | I-395 – Worcester, New Haven | Exits 21A-B on I-395; former Route 52 |
| New London | Lisbon | 20.43 | 32.88 | Route 138 west – Newent | Southern end of Route 138 concurrency |
| New London | Griswold | 20.82 | 33.51 | Route 138 east – Pachaug | Northern end of Route 138 concurrency |
| New London | Griswold | 21.05 | 33.88 | Route 201 south – Hopeville Pond State Park | Northern terminus of Route 201 |
| Windham | Canterbury | 23.57 | 37.93 | Butts Bridge Road (SR 668 west) | |
| Windham | Plainfield | 26.60 | 42.81 | To I-395 | Access via SR 647 |
| Windham | Plainfield | 27.50 | 44.26 | Route 14A west – Plainfield, Canterbury | Southern end of Route 14A concurrency |
| Windham | Plainfield | 27.91 | 44.92 | Route 14A east to I-395 – Sterling | Northern end of Route 14A concurrency |
| Windham | Plainfield | 30.31 | 48.78 | Route 14 east to I-395 – Moosup | Southern end of Route 14 concurrency |
| Windham | Plainfield | 30.59 | 49.23 | Route 14 west – Canterbury | Northern end of Route 14 concurrency |
| Windham | Plainfield | 32.12 | 51.69 | Route 205 north – Wauregan, Brooklyn | Southern terminus of Route 205 |
| Windham | Killingly | 36.15 | 58.18 | US 6 east to I-395 – Providence | Southern end of US 6 concurrency |
| Windham | Killingly | 36.51 | 58.76 | US 6 west – Hartford | Northern end of US 6 concurrency |
| Windham | Killingly | 37.19 | 59.85 | To I-395 | Access via SR 607 |
| Windham | Killingly | 39.46 | 63.50 | I-395 / Route 101 – Dayville, East Killingly | Exit 41 on I-395 |
| Windham | Killingly | 42.04 | 67.66 | Route 21 north – Putnam Heights | Southern terminus of Route 21 |
| Windham | Putnam | | | I-395 – Thompson, Webster, MA | Access via Heritage Road; exit 46 on I-395; former Route 52 |
| Windham | Putnam | 45.58 | 73.35 | US 44 west – Pomfret | Southern end of US 44 concurrency |
| Windham | Putnam | 46.02 | 74.06 | Route 171 west – Woodstock | Eastern terminus of Route 171 |
| Windham | Putnam | 46.22 | 74.38 | US 44 east to I-395 – East Putnam | Northern end of US 44 concurrency |
| Windham | Thompson | 48.17 | 77.52 | Route 193 north – Webster, MA | Southern terminus of Route 193 |
| Windham | Thompson | 48.88 | 78.66 | I-395 south – Norwich, New Haven | Exit 49 on I-395; former Route 52 |
| Windham | Thompson | 49.88 | 80.27 | Route 200 east – Thompson | Western terminus of Route 200 |
| Windham | Thompson | 51.95 | 83.61 | Route 131 west – Quinebaug, Southbridge, MA | Eastern terminus of Route 131 |
| Windham | Thompson | 54.46 | 87.64 | Route 12 north – Auburn, Worcester | Continuation into Massachusetts |
| 1.000 mi = 1.609 km; 1.000 km = 0.621 mi ||||||