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Interstate 476 Auxiliary route of the Interstate Highway System
Maintained by PennDOT and PTC
Length:	132.10 mi[1][2][3] (212.59 km)
Formed:	1964 (completed on December 19, 1991)[2]
South end:	I-95 near Chester
Major junctions:	US 1 near Springfield US 30 in Villanova I-76 in West Conshohocken I-276/PA Turnpike in Plymouth Meeting I-78 via US 22 near Allentown US 209 near Lehighton I-80 near Hickory Run State Park
North end:	I-81, US 6, and US 11 near Clarks Summit
Counties:	Delaware, Montgomery, Bucks, Lehigh, Carbon, Luzerne, Lackawanna
Pennsylvania State Routes < PA 475 PA 477 > < PA 8 PA 10 > < I-479 PA 481 > < PA 492 PA 501 > Minor - Legislative

Interstate 476 is a 132.10-mile (212.59 km) auxiliary Interstate Highway in the U.S. state of Pennsylvania designated between Interstate 95 near Chester and Interstate 81 near Scranton, serving as the primary north–south Interstate corridor through eastern Pennsylvania. It consists of both the 21.5 mile Mid-County Expressway, locally referred to as the "Blue Route" (although no signs exist with that designation), through the suburban Philadelphia counties of Delaware and Montgomery, and the 110.6 mile Northeast Extension of the Pennsylvania Turnpike connecting the Philadelphia metropolitan area with the Lehigh Valley, the Poconos, and the Wyoming Valley. The Blue Route passes through suburban areas, while the Northeast Extension predominantly runs through rural areas of mountains and farmland, with development closer to Philadelphia and in the Lehigh Valley and the Wyoming Valley. I-476 intersects many major roads including Interstate 76 (the Schuylkill Expressway) in West Conshohocken, Interstate 276 in Plymouth Meeting, U.S. Route 22 near Allentown, and Interstate 80 near Hickory Run State Park.

While proposed as early as 1929, the construction of the Mid-County Expressway through did not begin until 1967 and was not completed until 1991 due to massive community and environmental opposition during the freeway revolts of the 1960s and 1970s, leading The Philadelphia Inquirer to dub it "the most costly, most bitterly opposed highway in Pennsylvania history." In order to get the route through Delaware County built, it was built with many environmental compromises such as a parkway design and four lanes south of the Pennsylvania Route 3 interchange.The Mid-County Expressway received its "Blue Route" nickname from the chosen route through Delaware County on planning maps. Following the completion of the Mid-County Expressway, in 1996 the Interstate 476 designation was extended to include the entire length of the existing Northeast Extension, replacing PA 9. The Northeast Extension was built between 1955 and 1957 and was originally projected to continue past Clarks Summit to the New York border; however, I-81 was built between these two points instead. Since the extension, I-476 has been the longest auxiliary Interstate Highway in the United States. In addition, I-476 is longer than some main-line interstates such as Interstate 19 in Arizona.

Route description

Blue Route

The Blue Route north of US 1.

The portion of Interstate 476 between Interstate 95 and Interstate 276 runs north–south through Delaware and Montgomery Counties and is officially known as the Mid-County Expressway and the Veterans Memorial Highway, as well as by the nickname Blue Route. The road's southern terminus is a junction with Interstate 95 near Chester, a city southwest of Philadelphia, near Philadelphia International Airport.^[4] Heading north, the road immediately narrows to a four-lane parkway north of Exit 1, MacDade Boulevard. It winds through the western Philadelphia suburbs of Wallingford and Swarthmore, where I-476 comes to an interchange with Baltimore Pike. From here, the freeway continues north to Springfield, where it meets U.S. Route 1 at a three-level diamond interchange.^[4]

Past US 1, I-476 continues through wooded suburban areas and interchanges with Pennsylvania Route 3 in Broomall, where it widens to six lanes.^[4] The route continues to Radnor Township, on the Main Line, where it interchanges with U.S. Route 30.^[4] Stone monuments, including a large stone cairn atop a hill and a large crushed-stone image of a mythological griffin on a hillside, were constructed at the Route 30 interchange to commemorate Radnor's history as part of the Welsh Tract.^[5] Proceeding northward, the route enters Montgomery County and comes to an interchange with Interstate 76 (Schuylkill Expressway) at West Conshohocken. After crossing the Schuylkill River on the Pearl Harbor Memorial Bridge, the freeway heads into Plymouth Township, where it interchanges with Ridge Pike and Germantown Pike before coming to the Mid-County toll barrier with the Pennsylvania Turnpike in Plymouth Meeting.^[4][6]

Northeast Extension

Approaching exit 44 (PA 663).

Beyond the Mid-County toll barrier, Interstate 476 enters the Pennsylvania Turnpike system, interchanging with Interstate 276 and continuing north as the Northeast Extension (of the Pennsylvania Turnpike). The route continues through the Philadelphia suburbs as a four-lane road, interchanging with Pennsylvania Route 63 near Lansdale. Past this interchange, the route enters a more rural setting of woods and farms, crossing into Bucks County and coming to an interchange with Pennsylvania Route 663 near Quakertown. The Northeast Extension continues into Lehigh County, part of the Lehigh Valley metropolitan area, past the PA 663 interchange. Here, it interchanges with U.S. 22 (Lehigh Valley Thruway) near Allentown, which offers an indirect connection to Pennsylvania Route 309 and Interstate 78.^[4]

North of Allentown, the route passes through more farmland before passing under Blue Mountain in the Lehigh Tunnel and entering Carbon County in the Poconos. Here, I-476 crosses over the Lehigh River and interchanges with U.S. 209 near Lehighton. Continuing through mountainous areas, it cuts through Hickory Run State Park before interchanging with Interstate 80 and Pennsylvania Route 940 just to the north of the state park.^[4] The route continues through mountainous terrain, heading into Luzerne County and coming to an interchange with Pennsylvania Route 115 in Bear Creek that provides access to nearby Wilkes-Barre.^[4] The route comes to a toll barrier near Pittston that marks the northern end of the toll ticket system in the Northeast Extension.^[4][7] A short distance later, an interchange with Pennsylvania Route 315 provides indirect access to Interstate 81 and Scranton. Past this interchange, I-476 enters Lackawanna County and crosses built-up areas of the Wyoming Valley and skirts around Scranton, with a mainline toll barrier and an exit to Keyser Avenue. North of Scranton in Clarks Summit, the route comes to a hairpin curve and ends at an interchange with connections to Interstate 81, U.S. Route 6 and U.S. Route 11.^[6]

History

Mid-County Expressway

Originally planned as far back as 1929, the Mid-County Expressway was later proposed by the Pennsylvania Turnpike Commission as the "Chester Extension" of the Pennsylvania Turnpike in 1954. After the advent of the Interstate Highway System, the project was transferred to the Pennsylvania Department of Highways to be built as part of the system, designating it first as Interstate 495, and later as Interstate 480, as I-76 was designated as I-80S at the time. The present-day I-476 designation was assigned on February 6, 1964 when I-80S was renumbered as I-76.^[8]

A 1960 map of central Delaware County, oriented with east on top, outlining the proposed corridors of the Mid-County Expressway.

The road received its nickname from a 1958 location report indicating various proposed geographic configurations of an expressway through Delaware County with lines of various colors on a map. The "blue route" through the Crum Creek valley won out over other contenders, which included a more easterly "red route" and "yellow route" and a more westerly "green route".^[9]

As one of the most controversial Interstate Highways in Pennsylvania, construction of I-476 began in 1967, but was not completed until 1991 between MacDade Boulevard (Exit 1) and Interstate 76 (Exit 16), and until 1992 between Germantown Pike east/Chemical Road (Exit 19) and Interstate 276/Pennsylvania Turnpike (Exit 20), due to litigation between the Pennsylvania Department of Transportation and several communities in the road's path over environmental concerns. However, the section of Interstate 476 (south end of I-476) between I-95 and MacDade Blvd. (Exit 1) was opened in 1987, but the signs refer to as "To MacDade Blvd" until 1991 when I-476/The Blue Route was opened between Exits 1 and 16. An agreement in 1985 led to many environmental compromises in the road's design, including a downsized four-lane design south of Pennsylvania Route 3, ramp meters, and federal scenic route status, prohibiting the erection of advertisement billboards along the entire freeway portion. While the redesigned highway was largely well-received, the constriction to four lanes has led to bottleneck conditions in the area, and many communities that originally opposed the road have now called for its widening.^[10] The Philadelphia Inquirer dubbed I-476 "the most costly, most bitterly opposed highway in Pennsylvania history" due to the decades of opposition it garnered.^[11]

The road is currently undergoing a complete rehabilitation project, including paving, bridge repair, and ramp maintenance of the entire length of the freeway between Interstate 95 and the Pennsylvania Turnpike.^[12]

Northeast Extension

PA 9 (1955–1996)

The Northeast Extension of the Pennsylvania Turnpike system opened in stages from November 23, 1955 to November 7, 1957, and was originally designated Pennsylvania Route 9.^[13]

Lehigh Tunnel heading Southbound

The hairpin curve at the highway's northern terminus was designed to allow for expansion northward to the New York state line. However, as with the Chester Extension to the south, it was decided to incorporate this segment as part of Interstate 81 following the advent of the Interstate system.^[14]

The highway includes a major, 4,461-foot (1,360 m) tunnel through Blue Mountain known as the Lehigh Tunnel. The tunnel was named as such so as not to cause confusion with the existing Blue Mountain Tunnel on the mainline. The tunnel was originally to be named for Turnpike Commission chairman Thomas J. Evans, but this was changed due to his July 25, 1967 conviction for conspiracy to defraud the Turnpike Commission of $19 million. The Lehigh Tunnel was originally a two-lane tunnel in the manner of the mainline turnpike's original seven tunnels, until it was "twinned" in 1991.^[15]

In 1996, after the expansion of the Lehigh Tunnel and the completion of the I-276/I-476/PA 9 interchange, the I-476 designation was extended up the entire length of the Northeast Extension, replacing the PA 9 designation. This extension resulted in I-476 surpassing the 120-mile (190 km) Interstate 495 in Massachusetts as the longest auxiliary Interstate Highway.^[16]

The Pennsylvania Turnpike Commission is in the preliminary stages of planning the widening of the Northeast Extension from Mid-County to Lansdale from 4 lanes to 6. In January 2008, work began on the replacement of two bridges over the Northeast Extension to accommodate the widened highway. The widening is expected to be complete in 2013.^[17] Another project, located in Carbon County, will see the construction of a E-Z Pass-only "slip ramp" between the Northeast Extension and Pennsylvania Route 903 scheduled to be completed in 2011.^[18]

Exit list

County	Location	Mile[19]	#		Destinations	Notes
			Old	New
Delaware	Chester	0.00			I-95 – Philadelphia, Chester	Southbound exit and northbound entrance
	Ridley Township	0.48	1	1	MacDade Boulevard
	Springfield Township	3.39	2	3	Media, Swarthmore (Baltimore Pike)	Access to Swarthmore College
	Marple Township	5.07	3	5	US 1 – Lima, Springfield
		8.77	4	9	PA 3 – Broomall, Upper Darby	To Newtown Square and Havertown
	Radnor Township	13.24	5	13	US 30 – St. Davids, Villanova	Access to Villanova University, Eastern University, Cabrini College, Bryn Mawr College, and Haverford College
Montgomery	West Conshohocken	15.84	6	16	I-76 – Philadelphia, Valley Forge	Signed as exits 16A (east) and 16B (west) northbound
			6	16	To PA 23 – Conshohocken	Signed as exit 16A northbound
	Plymouth Meeting	18.81	7A	18A	Conshohocken (Ridge Pike east)	Northbound exit and southbound entrance
		18.81	7B	18B	Norristown (Ridge Pike west)	Signed as exit 18 southbound
		19.69	8	19	Germantown Pike – Plymouth Meeting	Northbound exit and southbound entrance; signed as exits 19 (east) and 20 (west)
			9	20	Plymouth Road	Northbound exit and southbound entrance
		19.97	25A	20	Mid-County toll plaza
		20.33			I-276 east / Penna. Tpk. east  – New Jersey	Mid-County Interchange
		20.33			I-276 west / Penna. Tpk. west – Norristown, Harrisburg	Mid-County Interchange; northbound exit is via exit 20
	Towamencin Township	30.78	31	31	PA 63 – Lansdale	Lansdale Interchange
Bucks	Milford Township	44.39	32	44	PA 663 – Pottstown, Quakertown	Quakertown Interchange
Lehigh	Lower Macungie Township.	56.37	Allentown Service Plaza
	South Whitehall Township.	57.71	33	56	US 22 to I-78 / PA 309 – Allentown, Harrisburg	Lehigh Valley Interchange
		71.68	Lehigh Tunnel
Carbon
	Franklin Township.	76.73	34	74	US 209 – Stroudsburg, Lehighton	Mahoning Valley Interchange. Access to Pocono towns of Jim Thorpe, Lehighton, Palmerton
	Penn Forest Township.	86.62	Hickory Run Service Plaza (closed for reconstruction)
					PA 903	Proposed E-Z Pass-only Slip Ramp. Access to Albrightsville and northern Carbon County
	Kidder Township.	95.25	35	95	I-80 / PA 940 – Hazleton, Mount Pocono	Pocono Interchange
Luzerne	Bear Creek Township.	105.85	36	105	PA 115 – Wilkes-Barre, Bear Creek	Wilkes-Barre Interchange
	Pittston Township.	113.42	Wyoming Valley Toll Plaza
		115.17	37	115	PA 315 to I-81 – Scranton, Pittston	Wyoming Valley Interchange
Lackawanna	Taylor	121.61	Keyser Avenue Toll Plaza
		122.36	38	122	Keyser Avenue – Old Forge, Taylor	Keyser Avenue Interchange
	Clarks Summit	131.20	39	131	Clarks Summit Toll Plaza
		131.37			I-81 / US 6 east  – Binghamton, Wilkes-Barre	Clarks Summit Interchange
					US 11 / US 6 west – Scranton, Clarks Summit	Northbound exit and southbound entrance; Clarks Summit Interchange

See also

• Pennsylvania Turnpike
• Interstate 276

References

External links

• I-476 Improvement Project

Auxiliary routes of Interstate 76 Pennsylvania: 176 • 276 • 376 • 476 • 576 (future) • 676 • 876 (former) — New Jersey: 676

Auxiliary routes of Interstate 80 California: 180 (former) • 280 • 380 • 480 (former) • 580 • 680 • 780 • 880 • 880 (former) • 980 — Nevada: 580 (unsigned) — Wyoming: 180 — Nebraska: 180 • 280 (former) • 480 • 580 (former) • 680 — Iowa: 280 • 380 • 480 • 680 — Illinois: 180 • 280 — Ohio: 280 • 480 • 680 — Pennsylvania: 180 • 180 (former) • 280 (former) • 380 • 480 (former) • 680 (former) — New Jersey: 280 • 680 (former)

Pennsylvania Interstate Highways 2 Digit Interstates I-70 • I-76 • I-78 • I-79 • I-80 • I-81 • I-83 • I-84 • I-86 • I-90 • I-95 • I-99 3 Digit Interstates I-176 • I-180 • I-276 • I-279 • I-283 • I-376 • I-380 • I-476 • I-579 • I-676

Pennsylvania Turnpike Commission Completed highways Mainline Turnpike • Northeast Extension • James E. Ross Highway • Amos K. Hutchinson Bypass (Turnpike 66) Partially-completed highways Mon/Fayette Expressway (Turnpike 43) • Southern Beltway (Turnpike 576) Tunnels Allegheny Mountain Tunnel • Blue Mountain Tunnel • Kittatinny Mountain Tunnel • Lehigh Tunnel • Tuscarora Mountain Tunnel Aborted expansion plans Chester Extension • Erie Extension • Gettysburg Extension • Keystone Shortway • Northwest & Southwest Extension • Philadelphia Loop Extension • Scranton Extension Historical Abandoned Pennsylvania Turnpike • Laurel Hill Tunnel • Negro Mountain Tunnel • Quemahoning Tunnel • Rays Hill Tunnel • Sideling Hill Tunnel • South Pennsylvania Railroad Tolling systems E-ZPass

Transportation infrastructure of the Lehigh Valley Interstates I-78 (PA·NJ) · I-476 Allentown skyline looking northwest from Albertus L. Meyers Bridge. U.S. Routes US 22 (PA·NJ) · US 222 · US 209 Pennsylvania Routes PA 29 · PA 33 · PA 100 · PA 143 · PA 145 · PA 191 · PA 212 · PA 222 · PA 248 · PA 309 · PA 329 · PA 378 · PA 412 · PA 512 · PA 611 · PA 863 · PA 873 · PA 946 · PA 987 New Jersey Routes NJ 57 · NJ 122 County Routes CR 519 · CR 579 Named roads/streets Bethlehem Pike · Cedar Crest Boulevard · Lehigh Street · Tilghman Street · Union Boulevard Bridges Albertus L. Meyers Bridge  · Hill to Hill Bridge  · Philip J. Fahy Memorial Bridge  · Minsi Trail Bridge  · Easton–Phillipsburg Toll Bridge  · Northampton Street Bridge  · Interstate 78 Toll Bridge Tunnels Lehigh Tunnel Public transportation Lehigh and Northampton Transportation Authority (Bethlehem Loop)  · Trans-Bridge Lines  · NJ Transit Airports Lehigh Valley International Airport · Allentown Queen City Municipal Airport Waterways Lehigh Canal · Delaware Division of the Pennsylvania Canal · Lehigh River · Delaware River · Monocacy Creek · Little Lehigh Creek · Jordan Creek Rail Conrail · Norfolk Southern Railway