  Route 159 | ||||||||||
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 Route 159 highlighted in red | ||||||||||
| Route information | ||||||||||
| Maintained byCTDOT | ||||||||||
| Length | 21.14 mi[1] (34.02 km) | |||||||||
| Existed | October 1968[3]–present | |||||||||
| Major junctions | ||||||||||
| South end | Main Street at theHartford–Windsor, CT line | |||||||||
| Major intersections |  I-91 in Windsor, CT  I-291 /Route 218 in Windsor, CTI-91 inWindsor Locks, CT Route 57 inAgawam, MA | |||||||||
| North end |   Route 75 /Route 147 in Agawam, MA | |||||||||
| Location | ||||||||||
| Country | United States | |||||||||
| States | Connecticut,Massachusetts | |||||||||
| Counties | CT:Hartford,MA:Hampden | |||||||||
| Highway system | ||||||||||
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Route 159 is a 21.14-mile-long (34.02 km)state highway connecting theHartford andSpringfield areas in theU.S. states ofConnecticut andMassachusetts. It begins at theHartford–Windsor town line and proceeds northward along the west bank of theConnecticut River towardsAgawam, Massachusetts. The route ends at the junction ofRoute 147 andRoute 75 in Agawam center just south of theWest Springfield city line. The route was originally designated asU.S. Route 5A in 1932 and was renumbered to its modern designation in October 1968.
Route 159 begins at theHartford–Windsor town line as a continuation of Main Street. It heads north as Windsor Avenue before meetingI-91 at Exit 41. In Windsor, it underpassesI-291, with access to and from the east provided by Deerfield Road. Almost immediately, it meets the eastern end ofRoute 218. After passing the east end ofRoute 178, Route 159 enters the center of Windsor, passing the town green before intersecting the southern end ofRoute 75. It then crosses theFarmington River, and starts to parallel the west bank of theConnecticut River, which it will for most of the rest of its length. InWindsor Locks, it meets I-91 once again at Exit 49, and has a brief overlap withRoute 140. It passes along the eastern side ofSuffield, where it has a brief overlap withRoute 190. It then crosses theMassachusetts state line intoAgawam,[1] where it passes bySix Flags New England before entering the center of town. North of the center, Route 159 has an interchange withRoute 57, before continuing north along Main Street to the intersection ofRoute 75 andRoute 147 just south of theWestfield River and theWest Springfield city line.[2]
Route 159 in Windsor is also known as theKasmir Pulaski Memorial Highway.[1]
Modern Route 159 roughly follows the path of theUpper Boston Post Road between Hartford and Springfield. In the 1920s, current Route 159 in Connecticut, with a few minor exceptions, was a primary state road designated asState Highway 110. Around 1930, the continuation in Massachusetts was numbered as State Route 5A, which ran along Main Street but continued north along River Road to the South End Bridge, where it crossed intoSpringfield to connect withUS 5. In the1932 state highway renumbering, the route in both Connecticut and Massachusetts was designated as US 5A. However, by 1938, Massachusetts redesignated its portion of the route as State Route 5A, truncating US 5A to the state line.[citation needed] The new State Route 5A was also relocated to follow Main Street into West Springfield, then continuing along River Street, Park Street, and Elm Street, where it ended at US 5. In October 1968, Connecticut decommissioned its US 5A and the road was redesignated in both states as Route 159.[3] The portion in West Springfield, which was not state-maintained, became an unnumbered road.
Mileposts reset at the state line.
| State | County | Location | mi[1] | km | Destinations | Notes |
|---|---|---|---|---|---|---|
| Connecticut | Hartford | Hartford–Windsor line | 0.00 | 0.00 | Main Street –North Hartford | Continuation south |
| Windsor | 0.23 | 0.37 | I-91 –Hartford,Springfield | Exit 41 on I-91 | ||
| 1.20– 1.24 | 1.93– 2.00 |   I-291 east /Route 218 west –South Windsor,Manchester,Bloomfield,West Hartford | Eastern terminus of Route 218; exit 1D on I-291 | |||
| 2.66 | 4.28 |  Route 178 west (Park Avenue) –Bloomfield | Eastern terminus of Route 178 | |||
| 3.76 | 6.05 |    Route 75 north /Route 305 west –Windsor Locks,Suffield,Bloomfield | Southern terminus of Route 75; eastern terminus of Route 305 | |||
| Windsor Locks | 8.52 | 13.71 | I-91 –Hartford,Springfield | Exit 49 on I-91 | ||
| 9.12 | 14.68 |   Route 140 west (Elm Street) –Bradley International Airport | Southern end of Route 140 concurrency | |||
| 9.42 | 15.16 |  Route 140 east (Bridge Street) –East Windsor,Ellington | Northern end of Route 140 concurrency | |||
| Suffield | 13.82 | 22.24 |  Route 190 east (Hazard Avenue) –Enfield | Southern end of Route 190 concurrency | ||
| 14.43 | 23.22 | Route 190 west (Thompsonville Road) –Suffield Center | Northern end of Route 190 concurrency | |||
| Connecticut–Massachusetts state line | 16.82 0.00 | 27.07 0.00 | Route transition | |||
| Massachusetts | Hampden | Agawam | 3.08 | 4.96 | Route 57 east –Springfield | Interchange |
| 4.32 | 6.95 |  Route 75 south /Route 147 –Suffield, CT,West Springfield,Feeding Hills | Northern terminus; northern terminus of Route 75 | |||
1.000 mi = 1.609 km; 1.000 km = 0.621 mi
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