Interstate 495 (Massachusetts)

I-495 bridge over the Merrimack River in Lawrence

Interstate 495 begins as the direct continuation of Route 25 at the intersection with Interstate 195 in West Wareham. It starts as a two-lane highway in both directions. It gets the third lane during the interchange with Route 24. The junction includes the unusual transition of shrinking from the six-lane Route 25 to the four-lane interstate, due to the third lane of Route 25 joining to and from I-195. The road heads roughly northwest, passing through the towns of Rochester and Middleborough (where the road meets U.S. Route 44) as a four-lane highway before entering Bristol County, crossing the Taunton River at Raynham. There, it becomes a six-lane highway just southeast of the Route 24 interchange (which is actually in neighboring Bridgewater).

The road continues northwest through Taunton and Norton before entering Mansfield, where there is a short collector-distributor road concurrency with Route 140. Interstate 495 makes its southern junction with its parent route, Interstate 95 on the border between Mansfield in Bristol County and Foxborough in Norfolk County. The road continues through Plainville (where there is a junction with U.S. Route 1, a popular exit for those heading to Gillette Stadium and Ledgeview Way) and Wrentham (where the Wrentham Village Premium Outlets lie beside the highway at Route 1A). The highway comes within 2 miles (3.2 km) of the Rhode Island state line before turning in a more northerly direction through Franklin and Bellingham.

Interstate 495 passes through Milford, Medway and Hopkinton (where the junction with the Massachusetts Turnpike, or Interstate 90, is located), Westborough (where the road meets Route 9). Southborough, Marlborough (where the road meets U.S. Route 20 and Interstate 290), Hudson, Berlin, Bolton (where the road finally begins to turn northeasterly) and Harvard.

Continuing to turn to a more easterly direction, the road passes through Boxborough, Littleton (where there is an intersection with Route 2), Westford and Chelmsford. At the Chelmsford-Lowell line lies the intersection with U.S. Route 3 and the Lowell Connector (formerly Business Spur 495). The road continues through Lowell and Tewksbury before entering Essex County at Andover, directly at exit 94 (formerly 39).

In Andover, the road has a junction with Interstate 93. It then enters the city of Lawrence, where the road turns due north, crossing the Shawsheen River into North Andover before crossing the Merrimack River at the O'Reilly Bridge back into Lawrence. It then heads into Methuen, where the road turns back to a northeasterly route after the junction with the Loop Connector (Rte. 213). The road heads into Haverhill, crossing the Merrimack twice more at a bend in the Bradford section of town. It passes north of downtown Haverhill, coming within 150 yards of the New Hampshire state line, the closest the road comes to leaving the state. Interstate 495 then passes through the towns of Merrimac and Amesbury before entering Salisbury where it immediately meets Interstate 95 and ends approximately 1.5 miles (2.4 km) south of where that interstate enters New Hampshire.

Throughout its path, the road passes closely to several existing state highways. From Wareham through to the Middleborough Rotary, it parallels Route 28. For much of the stretch between Norton and Milford, the road is within a few miles of Route 140, with two junctions of that highway in Mansfield and Franklin. From Milford to Bolton, the road passes just west of Route 85. Much of the northern third of the route also roughly parallels Massachusetts Route 110.[5]

As early as the late 1940s, a plan was developing for an "outer circumferential highway" around Boston, a limited-access freeway meant to have an approximate 30 mile (49 km) radius from the Boston city center. A portion of this new "outer circumferential highway" southeast of the US Route 1 junction in Foxborough was meant to be a "relocation" of the existing MA Route 28, which was quickly changed in 1947 to a new designation of Route 25 as a full-length freeway from MA 24 expwy in Raynham to Wareham. The section of I-495 between MA 24 in Raynham and I-95 at the Foxborough/Mansfield line began construction at I-95 in 1976 and finished at the MA 25/MA 24 interchange in 1982. (Prior to 1982, I-495 ended at I-95; the section from Raynham to Wareham was just signed as MA 25). MA 25 was constructed in stages from the late 1950s to the late 1960s.[6]

In 2014, a new ITS system was installed to help commuters and the state better understand the traffic congestion on I-495.[7] Some improvements expected to come to I-495 in the next few years include a project that will install fiber optic cable, traffic cameras and variable-message signs on I-495 from I-90 (Hopkinton) to I-93 (Andover).

In 2015, the state pledged $165–285 million for improvements to the Interstate 495-Massachusetts Turnpike intersection, and is considering three different plans. The work is expected to begin in 2021 and be completed in 2025.[8] Improvements to the 495-Route 9 intersection will commence at the same duration, with a different budget.[9]

Interchanges were to be renumbered to mileage-based numbers under a project scheduled to start in 2016, however this project was indefinitely postponed by MassDOT until November 18, 2019, when MassDOT confirmed that, beginning in late summer 2020, the exit renumbering project would start.[10][11] On May 7, 2021, MassDOT announced that I-495 exit numbers would get renumbered starting on or after May 16, and it would last for approximately five weeks. The project was broken down into four sections:

• Segment 1: between MA Route 28 and I-95 (old exits 3-13)
• Segment 2: between I-95 and I-90 (old exits 14-22)
• Segment 3: between I-90 and US Route 3 (old exits 23-35)
• Segment 4: between US Route 3 and junction MA Route 110/I-95 (old exits 37-55)

County	Location[12]	mi[12]	km	Old exit	New exit[13]	Destinations[13]	Notes
Plymouth	Wareham	0.000	0.000	-	-	Route 25 east – Cape Cod	Western terminus of Route 25; Blue Star Memorial Highway continues east
		0.012	0.019	-	1	I-195 west – Wareham, New Bedford, Providence, RI	Eastern terminus of I-195; exit 40B on I-195; Signed as New Bedford, Providence, RI NB; trumpet interchange.
		2.487	4.002	-	2	Route 58 north – Carver, Plymouth	No signage for Route 58 south, which ends at Route 28, 0.45 miles (720 m) to the south
	Middleborough	7.600	12.231	3	8	Route 28 – Rock Village, South Middleboro
		12.068	19.422	4	12	Route 105 – Middleboro Center, Lakeville
		14.304	23.020	5	14	Route 18 / US 44 east – Bridgewater, Plymouth, Lakeville, New Bedford	US 44 only appears on northbound signage
		14.722	23.693	6	15	US 44 – Middleboro, Plymouth, Taunton, Providence, RI
	Bridgewater	18.962	30.516	7A	19A	Route 24 north – Boston	Exits 22A-B on Route 24
		19.200	30.899	7B	19B	Route 24 south – Fall River
Bristol	Raynham	21.681	34.892	8	22	Route 138 – Stoughton, Taunton
	Taunton	24.508	39.442	9	25	Bay Street – Taunton, Easton
	Norton	26.906	43.301	10	27	Route 123 to Route 140 south – Norton, Easton	No southbound signage for Route 140
	Mansfield	29.875	48.079	11	30	Route 140 south – Norton	No northbound exit
		29.913	48.140	12	31	Route 140 north – Mansfield
		32.859	52.881	13A	33A	I-95 north – Boston	Exits 12A-B on I-95
Norfolk	Foxborough	32.935	53.004	13B	33B	I-95 south – Providence, RI
	Plainville	35.554	57.219	14A	36A	US 1 north – Wrentham	Access to Gillette Stadium and Patriot Place
		35.605	57.301	14B	36B	US 1 south – North Attleboro
	Wrentham	37.565	60.455	15	38	Route 1A – Wrentham, Plainville
	Franklin	40.954	65.909	16	41	King Street – Franklin, Woonsocket, RI
		43.183	69.496	17	43	Route 140 – Franklin, Bellingham
	Bellingham	45.820	73.740	18	46	Route 126 – Medway, Bellingham
Worcester	Milford	48.318	77.760	19	48	Route 109 – Milford, Medway	To Route 16
		50.245	80.861	20	50	Route 85 – Milford, Hopkinton
Middlesex	Hopkinton	54.151	87.148	21	54	W. Main Street – Hopkinton, Upton	Signed as exits 54A (east) and 54B (west)
Middlesex–Worcester county line	Hopkinton–Westborough line	57.928	93.226	22	58	I-90 Toll / Mass Pike – Boston, Albany, NY	Exit 106 on I-90
Worcester	Westborough	59.414	95.618	23A	59A	Route 9 east – Framingham
		59.472	95.711	23B	59B	Route 9 west – Worcester
Worcester–Middlesex county line	Southborough–Marlborough line	61.758	99.390	23C	62	Simarano Drive – Marlboro, Southboro	Interchange constructed in 2000
Middlesex	Marlborough	63.155	101.638	24	63	US 20 – Marlboro, Northboro	Split into exits 63A (east) and 63B (west)
		64.895	104.438	25A	65A	Route 85 – Hudson, Marlboro	Access to Route 85 via unsigned Route 85 Connector
		64.951	104.529	25B	65B	I-290 west – Worcester	Eastern terminus of I-290; exits 32A-B on I-290
Worcester	Berlin	67.314	108.331	26	67	Route 62 – Berlin, Hudson
	Bolton	70.006	112.664	27	70	Route 117 – Bolton, Stow
Middlesex	Boxborough	74.652	120.141	28	75	Route 111 – Boxboro, Harvard
	Littleton	77.641	124.951	29	78	Route 2 – Boston, Leominster	Split into exits 78A (east) and 78B (west); exits 113A-B on Route 2
		79.176	127.421	30	79	Route 2A / Route 110 – Littleton, Ayer
		80.209	129.084	31	80	Route 119 – Littleton, Groton
	Westford	83.297	134.054	32	83	To Route 110 (Boston Road) – Westford	To Route 225 – Carlisle
	Chelmsford	87.328	140.541	33	87	Route 4 – Chelmsford, North Chelmsford	Northbound exit and southbound entrance
		88.175	141.904	34	88	Route 110 to Route 4 – Chelmsford, Lowell	No signage for Route 4 northbound
		89.143	143.462	35A	89A	US 3 south – Burlington	Access via C/D lanes; exits 81A-B on US 3 north
				35B	89B	US 3 north – Nashua, NH	Access to and from C/D lanes; exits 81B-A on US 3 south, to Manchester-Boston Regional Airport
	Lowell	89.425	143.916	35C	89C	Lowell Connector	Formerly exit 36; access via C/D lanes; exits 2A and 1B on Lowell Conn.
		91.192	146.759	37	91	Woburn Street – South Lowell, North Billerica
	Tewksbury	92.284	148.517	38	92	Route 38 – Lowell, Tewksbury
Middlesex–Essex county line	Tewksbury–Andover line	94.613	152.265	39	94	Route 133 – Tewksbury, Andover	Southbound off-ramp begins in Essex County
Essex	Andover	97.000	156.106	40A	97A	I-93 south – Boston	Exits 40A-B on I-93
		97.045	156.179	40B	97B	I-93 north – Salem, NH
		99.411	159.986	41	99	Route 28 – Lawrence, Andover	Split into exits 99A (south) and 99B (north) northbound
	Lawrence	100.149	161.174	42	100	Route 114 – North Andover, South Lawrence	Split into exits 100A (east) and 100B (west)
	North Andover	100.953	162.468	43	101	Massachusetts Avenue – North Andover	Southbound access from C/D lanes originating at Marston St. exit
	North Andover–Lawrence line	101.370– 101.938	163.139– 164.053	44	102	Merrimack Street	Access via C/D lanes; NB ramp exits onto SB C/D lanes to Merrimack St.; NB entrance includes direct entrance from Sutton Street
	Lawrence			45A	103A	Commonwealth Drive Marston Street north – Methuen	Northbound signage; accessible to and from C/D lanes Southbound signage; accessible to and from C/D lanes
				45B	103B	Marston Street south – Lawrence	Access to and from C/D lanes
	Methuen	103.121	165.957	46	104	Route 110 (Merrimack Street) – Pleasant Valley
		104.057	167.464	47	105	Route 213 (Loop Connector) to I-93 north – Methuen, Salem NH	Exit 5 on Route 213; eastern terminus of Rte. 213
	Haverhill	105.788	170.249	48	106	To Route 125 – Ward Hill, Bradford	Access via Industrial Avenue
		106.624	171.595	49	107	Route 110 / Route 113 (River Street)
		107.303	172.687	50	108	Route 97 – Haverhill, Salem, NH
		108.997	175.414	51	109	Route 125 – Haverhill, Plaistow, NH	Split into exits 109A (south) and 109B (north)
		111.182	178.930	52	111	Route 110 – Haverhill, Merrimac
	Merrimac	114.894	184.904	53	115	Broad Street – Merrimac, Merrimacport
	Amesbury	117.854	189.668	54	118	Route 150 – Amesbury, Seabrook, NH
		118.880	191.319	55	119	Route 110 east to I-95 south – Salisbury, Boston	Northbound exit and southbound entrance
	Salisbury	120.95	194.65	-	-	I-95 north – Portsmouth, NH	Northern terminus; exit 89 on I-95; access to I-95 south via Route 110
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Incomplete access       Tolled       Route transition