Interstate 78 in Pennsylvania

Interstate 78 (I-78) is a major east–west Interstate Highway stretching from Union Township, Lebanon County, Pennsylvania, in the west to the Holland Tunnel and New York City in the east. In Pennsylvania, I-78 runs for about 78 miles (126 km) from the western terminus at I-81 in Union Township east to the New Jersey state line near Easton in Northampton County.

Interstate 78 marker
Interstate 78
Map
I-78 highlighted in red
Route information
Maintained by PennDOT and DRJTBC
Length77.95 mi[1] (125.45 km)
Existed1957–present
HistoryCompleted in 1989
NHSEntire route
Major junctions
West end I-81 in Union Township
Major intersections
East end I-78 at the New Jersey state line in Williams Township
Location
CountryUnited States
StatePennsylvania
CountiesLebanon, Berks, Lehigh, Northampton
Highway system
PA 77 PA 78
PA 177I-178 PA 178

Much of I-78 west of Allentown predates the Interstate Highway System as a freeway upgrade of U.S. Route 22 (US 22), which runs concurrently with I-78 between Bethel Township and Upper Macungie Township. The Interstate, originally planned as Interstate 80N (I-80N), was supposed to continue its concurrency with US 22 to the New Jersey state line but was realigned to the south due to local opposition.

Two auxiliary routes, Interstate 178 (I-178) and I-378, were also planned as spurs into Allentown and Bethlehem respectively, but I-178 was never built and I-378 became Pennsylvania Route 378 (PA 378) since it no longer connected to I-78. Improvement of the highway in Berks County is currently underway.

Route description

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Lebanon and Berks counties

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I-78/US 22 eastbound past the Shartlesville exit

I-78 begins at an interchange with I-81 in Union Township in Lebanon County, heading east as a four-lane freeway. In Lebanon County, I-78 is known as the 78th Division Highway.[2] The road passes under PA 72 and turns northeast through a mix of farmland and woodland, crossing the Swatara Creek into Swatara Township. The freeway continues through agricultural areas with some trees, curving east and entering Bethel Township. I-78 passes north of Fredericksburg and comes to an eastbound exit and westbound entrance with the northern terminus of PA 343. Following this, the freeway passes through more rural areas with some nearby development and reaches a westbound exit and eastbound entrance with US 22 (William Penn Highway). At this point, US 22 becomes concurrent with I-78 and the median of the freeway narrows from a grassy median to a Jersey barrier.[3][4]

I-78/US 22 enters Bethel Township in Berks County and heads east-northeast through agricultural areas to the south of the Blue Mountain ridge, coming to a diamond interchange with PA 645 north of Frystown. The road continues through farmland with some warehouses and reaches a diamond interchange with PA 501 north of Bethel. The freeway heads through a mix of farms and woods, passing to the south of Grimes Airport and coming to a right-in/right-out interchange with Court Street eastbound and Frantz Road westbound; this interchange has no access across the freeway. I-78/US 22 soon reaches a diamond interchange with Midway Road as it passes through more rural land, coming to a diamond interchange with PA 419 south of Schubert. Past this interchange, the road runs through a mix of farms and woods, crossing the Little Swatara Creek into Upper Tulpehocken Township. The freeway reaches a diamond interchange with PA 183 north of Strausstown and continues through agricultural areas with some woodland. I-78/US 22 crosses Northkill Creek into Upper Bern Township and comes to a diamond interchange with Mountain Road north of Shartlesville.[3][5] At this point, I-78/US 22 becomes the CMSgt. Richard L. Etchberger Memorial Highway, in honor of Richard Etchberger.[6] Following this interchange, the road heads northeast through farm fields with some trees and homes and crosses into Tilden Township.[3][5]

In Tilden Township, the freeway continues northeast and reaches a partial cloverleaf interchange with PA 61 in a business area that includes a 250,000-square-foot (23,000 m2) Cabela's store. Past PA 61, I-78/US 22 comes to a bridge over the Reading Blue Mountain and Northern Railroad's Reading Division line and the Schuylkill River. Upon crossing the river, I-78/US 22 enters the borough of Hamburg and passes through residential areas, coming to a diamond interchange at North 4th Street that serves Hamburg. The road leaves Hamburg for Windsor Township and heads through agricultural areas with some woods and homes, curving to the east. Farther east, the parallel Blue Mountain ridge heads further north from the freeway. I-78/US 22 crosses into Greenwich Township and comes to a partial cloverleaf interchange with PA 143 north of the borough of Lenhartsville. The CMSgt. Richard L. Etchberger Memorial Highway name for I-78/US 22 ends at this interchange. Past this interchange, the road crosses Maiden Creek and runs through a mix of farm fields and woodland. Farther east, the freeway reaches a diamond interchange with PA 737 south of Krumsville. The road continues east through rural land with some nearby development, passing through the northern corner of Maxatawny Township.[3][5]

Lehigh and Northampton counties

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I-78 eastbound at split with US 22 eastbound in Upper Macungie Township

I-78/US 22 enters Weisenberg Township in Lehigh County, where the freeway becomes the Walter J. Dealtrey Memorial Highway[7] and continues east through farms and woods in the Lehigh Valley, passing north of New Smithville. The road passes south of warehouses and comes to a diamond interchange with PA 863.

Following this interchange, the freeway heads to the south of more warehouses and runs through more rural areas with some homes, crossing into Upper Macungie Township. I-78/US 22 runs between farm fields to the north and warehouses and industrial development to the south before it comes to a cloverleaf interchange with PA 100 in a business area in Fogelsville. After the PA 100 interchange, the freeway widens to six lanes and heads east through industrial areas, coming to a bridge over Norfolk Southern Railway's C&F Secondary railroad line before curving northeast. In Kuhnsville, US 22 splits from I-78 at an eastbound exit and westbound entrance by heading northeast on a freeway called the Lehigh Valley Thruway. From here, I-78 continues east-southeast as a four-lane freeway, passing residential subdivisions with some commercial development. The freeway continues southeast and passes over I-476 (Pennsylvania Turnpike Northeast Extension) before it comes to a westbound exit and eastbound entrance with the PA 309 freeway.[3][8]

At this point, PA 309 becomes concurrent with I-78 and the freeway enters Lower Macungie Township, widening to six lanes and running past commercial development to the southwest of the Dorney Park & Wildwater Kingdom amusement park. The freeway reaches a partial cloverleaf interchange with the northern terminus of US 222 and the southern terminus of PA 222 at Hamilton Boulevard, which provides access to the cities of Allentown and Reading. Following this interchange, the road crosses into South Whitehall Township and heads east between residential areas to the north and farm fields to the south, before entering Salisbury Township and passing north of Lehigh Valley Hospital–Cedar Crest. Past the hospital, I-78/PA 309 comes to a partial cloverleaf interchange with the northern terminus of the southern section of PA 29 at Cedar Crest Boulevard before running between residential areas to the north and office buildings to the south. The freeway enters Allentown and runs through woodland, crossing Little Lehigh Creek before it passes through a small section of Salisbury Township. The road heads back into Allentown and runs near residential areas, passing south of Allentown Queen City Municipal Airport before it comes to a partial cloverleaf interchange at Lehigh Street. I-78/PA 309 runs near industrial areas and passes over Norfolk Southern Railway's Reading Line before coming to a westbound exit ramp serving Emaus Avenue. The freeway passes near neighborhoods before it leaves Allentown for Salisbury Township, where it ascends forested South Mountain. The highway comes to an eastbound exit and westbound entrance with Rock Road that provides a connection to PA 145 in Summit Lawn, where it crosses into Upper Saucon Township. Following this, the freeway turns southeast and comes to an interchange with the southern terminus of PA 145 in Lanark, at which point PA 309 splits from I-78 by heading southeast on a surface road toward the borough of Quakertown. From here, I-78 turns northeast, narrowing to four lanes with the median changing from a Jersey barrier to a grassy median. The road heads between South Mountain to the northwest and a mix of farm fields, woods, and development to the southeast.[3][8]

 
I-78 westbound past the PA 412 interchange in Bethlehem

I-78 enters Lower Saucon Township in Northampton County and passes over PA 378 as it curves north near residential development. The road turns to the east-northeast and runs between forested South Mountain to the north and farmland and homes to the south, entering Bethlehem. The freeway crosses the Saucon Creek and becomes the border between Bethlehem to the north and the borough of Hellertown to the south before it comes to a partial cloverleaf interchange with PA 412 that serves Bethlehem and Hellertown. Following this interchange, I-78 fully enters Bethlehem before it crosses back into Lower Saucon Township, turning to the northeast and running through wooded areas with some farm fields and homes, heading across the East Branch Saucon Creek. The road comes to a trumpet interchange with the southern terminus of the PA 33 freeway, which heads north toward the Pocono Mountains region. Past this interchange, the freeway crosses into Williams Township and continues through rural areas with some development, crossing into the borough of Glendon. I-78 turns east as it passes south of industrial areas, leaving Glendon for Williams Township. The road comes to a diamond interchange with Morgan Hill Road, which heads north into Easton and provides access to PA 611 via city streets. Past this interchange, the freeway widens to six lanes and passes near residential and commercial development, coming to a westbound welcome center and a westbound toll plaza for the Interstate 78 Toll Bridge. From here, I-78 runs through wooded areas and turns southeast, heading onto the Interstate 78 Toll Bridge, which carries the freeway over PA 611 and the Delaware Canal before crossing the Delaware River where I-78 enters New Jersey.[3][9]

History

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Construction of the freeway between Lebanon and Lehigh counties took place between 1950 and 1970, originally as an upgraded alignment of US 22. All of I-78 was completed by 1989. When the Interstate Highway System numbers were first assigned in 1957, the route was planned as I-80N.[10] Prior to the late 1960s, I-78 was to be routed on the Lehigh Valley Thruway across to Phillipsburg, New Jersey, continuing the concurrency with US 22; however, because of heavy opposition by residents of Phillipsburg, the Pennsylvania Department of Transportation (PennDOT) and the New Jersey Department of Transportation (NJDOT) opted to build the new southerly route I-78 follows today.[11]

Interstate 178

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Interstate 178
LocationAllentown, Pennsylvania
Existed1950s–1971

Interstate 178 (I-178) was a proposed spur from I-78 but was canceled because the Liberty Bell Museum, which had since closed, was in the path of the proposed expressway. Additionally, locals opposed the destruction of Sixth and Seventh Streets to accommodate the highway. The planned northern terminus would have been between the 15th Street and PA 145 interchanges.[12] If built, I-178 would have connected US 22, formerly designated I-78, into Allentown.[13]

This route was shown in Rand McNally atlases in the late 1960s but was not included in the 1971 federal Interstate route log.[14] The route was supposed to end near Muhlenberg College.[15]

Interstate 378

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Interstate 378
LocationBethlehem, Pennsylvania
Existed1968–1971

I-378 was the designation for a spur route that would extend from I-78 into Bethlehem. At the time, I-78 was designated as the Lehigh Valley Thruway, concurrent with US 22. Unlike I-178, the route was built. When I-78 was later redirected south of this area, I-378 had no direct connection to I-78 and therefore was renumbered to PA 378. The route still remains, as a freeway with exits and their own numbers.

When I-178 and I-378 were planned (and I-378 was built), I-78 ran the length of the Lehigh Valley Thruway. Later, I-78 was rerouted onto a bypass route south of the Thruway. This was due to opposition to continue the concurrency with the Lehigh Valley Thruway into New Jersey.

Improvements in Berks County

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I-78/US 22 westbound at the PA 737 interchange in Krumsville

In 2013, PennDOT announced plans to improve a portion of I-78 in eastern Berks County. The project will redesign the PA 737 interchange, add truck lanes, widen lanes and shoulders, and raise the height of three overpasses.[16] Construction began in 2015 and is planned to be completed in 2025 at a cost of $412.6 million.[17] In 2020, a project began to improve the section of I-78 in Hamburg by reconstructing and reconfiguring the PA 61 interchange and widening and rehabilitating the bridges over the Schuylkill River and Port Clinton Avenue. Construction on this project is planned to be completed in December 2025 at a cost of $125.4 million.[18]

Exit list

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CountyLocationmi[19]kmOld exit
[20]
New exit
[20]
DestinationsNotes
LebanonUnion Township0.000.001B 
 
I-81 south – Harrisburg
Exit 89 on I-81
0.550.891A 
 
I-81 north – Hazleton
Bethel Township5.859.4116 
 
PA 343 south – Lebanon, Fredericksburg
Eastbound exit and westbound entrance; northern terminus of PA 343
7.9012.7118 
 
 
 
US 22 west to PA 343 – Lebanon, Fredericksburg
Westbound exit and eastbound entrance; western terminus of US 22 concurrency
BerksBethel Township10.2116.43210  PA 645 – Frystown
12.6820.41313  PA 501 – Bethel
14.6723.61415GrimesRight-in/right-out; access via Court Street eastbound, Frantz Road westbound; no access across I-78/US 22; no tractor trailers
15.4024.78516MidwayAccess via Midway Road
16.5826.68617  PA 419 – RehrersburgAccess to Conrad Weiser Homestead
Upper Tulpehocken Township18.6530.01719  PA 183 – Strausstown
Upper Bern Township22.7136.55823ShartlesvilleAccess via Mountain Road
Tilden Township29.11–
29.35
46.85–
47.23
929  PA 61 – Pottsville, Reading
Hamburg30.1948.591030HamburgAccess via North Fourth Street
Greenwich Township35.2356.701135  PA 143 – Lenhartsville
40.2764.811240  PA 737 – Kutztown, KrumsvilleAccess to Kutztown University
LehighWeisenberg Township44.9672.361345  PA 863 – Lynnport, New Smithville
Upper Macungie Township49.26–
49.55
79.28–
79.74
1449  PA 100 – Trexlertown, FogelsvilleSigned as exits 49A (south) and 49B (north)
50.8981.901551 
 
 
 
 
 
 
 
 
 
  US 22 east to I-476 Toll / Penna Turnpike NE Extension / PA 309 north – Lehigh Valley International Airport
Eastbound exit and westbound entrance; eastern terminus of US 22 concurrency
Lower Macungie Township53.6786.3753 
 
 
 
 
 
 
PA 309 north to I-476 Toll / Penna Turnpike NE Extension – Tamaqua
Westbound exit and eastbound entrance; western terminus of PA 309 concurrency
Lower MacungieSouth Whitehall
township line
54.12–
54.51
87.10–
87.73
1654 
 
 
 
US 222 south / PA 222 north (Hamilton Boulevard)
Signed as exits 54A (south) and 54B (north) westbound; northern terminus of US 222; southern terminus of PA 222; access to Reading, Allentown Center City, and Dorney Park & Wildwater Kingdom
Salisbury Township55.4189.171755 
 
PA 29 south (Cedar Crest Boulevard)
Northern terminus of southern segment of PA 29
Allentown57.2092.051857Lehigh Street
57.6392.7518B58Emaus Avenue southWestbound exit only
Upper Saucon Township58.8394.681959 
 
To PA 145 – Summit Lawn
Eastbound exit and westbound entrance; access via Rock Road
59.9296.4320A60A 
 
PA 309 south – Quakertown
Eastern terminus of PA 309 concurrency; signed as exit 60 eastbound; access to DeSales University
60.3097.0420B60B 
 
PA 145 north (South 4th Street)
Westbound exit only; southern terminus of PA 145; access to Allentown Center City
NorthamptonBethlehem66.36106.802167  PA 412 – Hellertown, BethlehemAccess to Lehigh University and Wind Creek Bethlehem
Lower Saucon Township71.04114.3371 
 
 
 
  PA 33 north to US 22 – Stroudsburg
Southern terminus of PA 33; access to Lehigh Valley International Airport and Pocono Mountains
Williams Township75.00120.702275 
 
To PA 611 – Easton, Philadelphia
Access via Morgan Hill Road; access to Crayola Attractions and Lafayette College
Rest area and welcome center (westbound)
Toll plaza (westbound only)
Delaware River77.10124.08Interstate 78 Toll Bridge
 
 
I-78 east – New York City
Continuation into New Jersey
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

See also

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References

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  1. ^ Federal Highway Administration (December 31, 2021). "Table 1 - Main Routes". FHWA Route Log and Finder List. Retrieved May 30, 2022.
  2. ^ "Roxanne H. Jones Avenue, 78th Division, POW/MIA Remembrance and Prisoner of War/Missing in Action Highways and Arthur F. Detisch Memorial Bridge - Designations" (PDF). www.legis.state.pa.us. December 21, 1998. Retrieved May 30, 2022.
  3. ^ a b c d e f g "Interstate 78 in Pennsylvania" (Map). Google Maps. Retrieved October 16, 2019.
  4. ^ Lebanon County, Pennsylvania Highway Map (PDF) (Map). PennDOT. 2019. Retrieved October 16, 2019.
  5. ^ a b c Berks County, Pennsylvania Highway Map (PDF) (Map). PennDOT. 2019. Archived from the original (PDF) on October 16, 2015. Retrieved October 16, 2019.
  6. ^ "CMSgt. Richard L. Etchberger Memorial Highway - Designation" (PDF). www.legis.state.pa.us. May 27, 2011. Retrieved May 30, 2022.
  7. ^ Steve Esack (January 30, 2004). "Section of I-78 named to honor businessman Walter J. Dealtrey - Morning Call". Articles.mcall.com. Retrieved January 29, 2013.
  8. ^ a b Lehigh County, Pennsylvania Highway Map (PDF) (Map). PennDOT. 2019. Archived from the original (PDF) on October 16, 2015. Retrieved October 16, 2019.
  9. ^ Northampton County, Pennsylvania Highway Map (PDF) (Map). PennDOT. 2019. Archived from the original (PDF) on December 6, 2017. Retrieved October 16, 2019.
  10. ^ Official Route Numbering for the National System of Interstate and Defense Highways (Map). American Association of State Highway Officials. August 14, 1957. Retrieved January 3, 2017.
  11. ^ "Interstate-Guide: Interstate 78". www.interstate-guide.com. Retrieved March 26, 2016.
  12. ^ "Pennsylvania's Dearly Departed Interstates".
  13. ^ "I-178 (cancelled) Pennsylvania".
  14. ^ "1963 Rand McNally".
  15. ^ "I-178 Map".
  16. ^ Devlin, Ron (January 18, 2013). "PennDOT unveils upgrade to Interstate 78". Reading Eagle. Archived from the original on February 16, 2013. Retrieved January 18, 2013.
  17. ^ Winfrey, Katiera; Wivell, Dawn (March 7, 2019). "PennDOT, Berks Planning Commission provide update on I-78". 69 News. Retrieved March 16, 2019.
  18. ^ Lee, Christine (February 18, 2020). "Bridges on I-78, Route 61 to be upgraded, replaced". Republican Herald. Pottsville, PA. Retrieved March 13, 2021.
  19. ^ Calculated using DeLorme Street Atlas USA 2007
  20. ^ a b "Pennsylvania Exit Numbering" (PDF). Pennsylvania Department of Transportation. Retrieved October 2, 2007.
  Interstate 78
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Pennsylvania Next state:
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