Interstate 81 (I-81) is a north–south

Interstate Highway The Dwight D. Eisenhower National System of Interstate and Defense Highways, commonly known as the Interstate Highway System, or the Eisenhower Interstate System, is a network of controlled-access highways that forms part of the National Hi ...

, stretching from

Dandridge, Tennessee Dandridge is a town in and the county seat of Jefferson County, Tennessee. It had a population of 3,341 at the 2020 census. The town is part of the Morristown, Tennessee Metropolitan Statistical Area, which consists of Jefferson and Hamblen co ...

, northeast to

Fisher's Landing, New York Wellesley Island is an island in Jefferson County, New York, the island is partially in the Town of Orleans and partially in the Town of Alexandria. History The island was named Wells Island but during his 1815 survey of the US-Canada borde ...

, at the

Canada–United States border The international border between Canada and the United States is the longest in the world by total length. The boundary (including boundaries in the Great Lakes, Atlantic, and Pacific coasts) is long. The land border has two sections: Canada' ...

. In

Pennsylvania Pennsylvania, officially the Commonwealth of Pennsylvania, is a U.S. state, state spanning the Mid-Atlantic (United States), Mid-Atlantic, Northeastern United States, Northeastern, Appalachian, and Great Lakes region, Great Lakes regions o ...

, I-81 runs for from the Maryland state line northeast to the New York state line near Hallstead and is called the American Legion Memorial Highway. The interstate enters the state near the borough of Greencastle, serving the boroughs of

Chambersburg Chambersburg is a borough in and the county seat of Franklin County, in the South Central region of Pennsylvania, United States. It is in the Cumberland Valley, which is part of the Great Appalachian Valley, and north of Maryland and the Ma ...

and

Carlisle Carlisle ( , ; from ) is a city in the Cumberland district of Cumbria, England. Carlisle's early history is marked by the establishment of a settlement called Luguvalium to serve forts along Hadrian's Wall in Roman Britain. Due to its pro ...

, before reaching

Harrisburg Harrisburg ( ; ) is the List of capitals in the United States, capital city of the Commonwealth (U.S. state), U.S. commonwealth of Pennsylvania and the county seat, seat of Dauphin County, Pennsylvania, Dauphin County. With a population of 50, ...

, the capital. After that, it climbs into the

Pocono Mountains The Pocono Mountains, commonly referred to as the Poconos (), are a geographical, geological, and cultural region in Northeastern Pennsylvania. They overlook the Delaware River and Delaware Water Gap to the east, Lake Wallenpaupack to the nort ...

to run through the

Wyoming Valley The Wyoming Valley is a historic industrialized region of Northeastern Pennsylvania. The region is historically notable for its influence in helping fuel the American Industrial Revolution with its many anthracite coal mines. As a metropolitan ar ...

, then exits into New York. It is the longest north–south Interstate in Pennsylvania.

Route description

I-81 enters

at the

Maryland Maryland ( ) is a U.S. state, state in the Mid-Atlantic (United States), Mid-Atlantic region of the United States. It borders the states of Virginia to its south, West Virginia to its west, Pennsylvania to its north, and Delaware to its east ...

state line about south of

; it also has its first exit at the state line, junctioning with Pennsylvania Route 163 (PA 163) there. In Chambersburg at exit 16, it meets U.S. Route 30 (US 30; the Chambersburg Pike to Gettysburg). About north of

at exit 52, it meets US 11, which connects to the

Pennsylvania Turnpike The Pennsylvania Turnpike, sometimes shortened to Penna Turnpike or PA Turnpike, is a controlled-access toll road which is operated by the Pennsylvania Turnpike Commission (PTC) in Pennsylvania. It runs for across the southern part of the st ...

/ I-76 (halfway between

Philadelphia Philadelphia ( ), colloquially referred to as Philly, is the List of municipalities in Pennsylvania, most populous city in the U.S. state of Pennsylvania and the List of United States cities by population, sixth-most populous city in the Unit ...

and

Pittsburgh Pittsburgh ( ) is a city in Allegheny County, Pennsylvania, United States, and its county seat. It is the List of municipalities in Pennsylvania#Municipalities, second-most populous city in Pennsylvania (after Philadelphia) and the List of Un ...

), since I-81 has no direct interchange with I-76. The stretch of US 11 connecting I-81 to I-76 is known locally as the "Miracle Mile" since it contains plenty of traveler services including restaurants, gas stations, lodging, truck stops, and shops. From here, I-81 travels in an almost precisely east–west direction for the next (until exit 89). At exit 59, it has an interchange with the western terminus of PA 581. I-81 becomes the

Capital Beltway The Capital Beltway, designated as Interstate 495 (I-495) for its entire length, is an List of auxiliary Interstate Highways, auxiliary Interstate Highway in the Washington metropolitan area. The Ring road, beltway encircles Washington, D.C., ...

from exit 59 to exit 70. At exit 67, the road comes to a

stack interchange A directional interchange, colloquially known as a stack interchange, is a type of grade-separated junction between two controlled-access highways that allows for free-flowing movement to and from all directions of traffic. These interchanges e ...

with US 22 and US 322; US 322 merges with I-81. Exit 70 is the eastern terminus of the US 322

concurrency Concurrent means happening at the same time. Concurrency, concurrent, or concurrence may refer to: Law * Concurrence, in jurisprudence, the need to prove both ''actus reus'' and ''mens rea'' * Concurring opinion (also called a "concurrence"), a ...

and the northern terminus of I-83 and is located in Colonial Park. For the entire segment between the

Mason–Dixon line The Mason–Dixon line, sometimes referred to as Mason and Dixon's Line, is a demarcation line separating four U.S. states: Pennsylvania, Maryland, Delaware and West Virginia. It was Surveying, surveyed between 1763 and 1767 by Charles Mason ...

and I-78, I-81 runs through the Great Valley. North of Harrisburg between I-83/US 322 and I-78, the highway passes near

Hershey Hershey may refer to: People * Hershey (name), a list of people with the surname, given name or nickname Places * Hershey, Nebraska, a village * Hershey, Pennsylvania, an unincorporated community, home to the chocolate company * Hershey, Cuba ...

and

Fort Indiantown Gap Fort Indiantown Gap, also referred to as "The Gap" or "FIG", is a census-designated place and National Guard Training Center primarily located in Lebanon County, Pennsylvania, United States. A portion of the installation is located in eastern ...

. At milemarker 89, I-81 meets the western terminus of I-78; I-78 picks up the eastward route through the Great Valley and heads toward

Allentown Allentown may refer to: Places * Allentown, California, now called Toadtown, California * Allentown, Georgia, a city in four counties in Georgia * Allentown, Illinois, an unincorporated community in Tazewell County * Allentown, New Jersey, a boroug ...

and

New York City New York, often called New York City (NYC), is the most populous city in the United States, located at the southern tip of New York State on one of the world's largest natural harbors. The city comprises five boroughs, each coextensive w ...

, while I-81 turns back northward, cutting through Blue Mountain at Swatara Gap. From milemarkers 141 to 146, I-81 passes near the city of Hazleton. At exit 151, I-81 meets

I-80 Interstate 80 (I-80) is an east–west transcontinental freeway that crosses the United States from San Francisco, California, to Teaneck, New Jersey, in the New York metropolitan area. The highway was designated in 1956 as one of the ori ...

. As motorists enter

Wilkes-Barre Wilkes-Barre ( , alternatively or ) is a city in Luzerne County, Pennsylvania, United States, and its county seat. Located at the center of the Wyoming Valley in Northeastern Pennsylvania, it had a population of 44,328 in the 2020 census. ...

at milemarker 165, I-81 merges with PA 309 for . At exit 175, I-81 meets with PA 315, which connects to

I-476 Interstate 476 (I-476) is a auxiliary Interstate Highway of I-76 in the U.S. state of Pennsylvania. The highway runs from I-95 near Chester north to I-81 near Scranton, serving as the primary north–south Interstate corridor through ea ...

( Pennsylvania Turnpike Northeast Extension). In

Scranton Scranton is a city in and the county seat of Lackawanna County, Pennsylvania, United States. With a population of 76,328 as of the 2020 United States census, 2020 census, Scranton is the most populous city in Northeastern Pennsylvania and the ...

at milemarker 185, there is a short freeway called the President Biden Expressway, which heads into downtown Scranton. At milemarker 187, I-81 is at the Throop Dunmore Interchange, which consists of

I-84 Interstate 84 may refer to: * Interstate 84 (Oregon–Utah), passing through Idaho, formerly known as Interstate 80N * Interstate 84 (Pennsylvania–Massachusetts), passing through New York and Connecticut {{road disambiguation ...

I-380 Interstate 380 may refer to: * Interstate 380 (California), a spur from Interstate 280 to U.S. Route 101 and the San Francisco International Airport * Interstate 380 (Iowa), a spur from Interstate 80 that starts in Iowa City and eventually ends ...

, and US 6. US 6 merges with I-81 for from milemarkers 187 to 194. At milemarker 194 is the northern terminus of I-476. The last exit in Pennsylvania is exit 230, which is PA 171 near Hallstead. I-81 reaches the

New York New York most commonly refers to: * New York (state), a state in the northeastern United States * New York City, the most populous city in the United States, located in the state of New York New York may also refer to: Places United Kingdom * ...

state line north of exit 230.

History

toll highway A toll road, also known as a turnpike or tollway, is a public or private road for which a fee (or ''Toll (fee), toll'') is assessed for passage. It is a form of road pricing typically implemented to help recoup the costs of road construction and ...

along the present-day I-81 corridor through Pennsylvania was planned in the 1950s. The section from

to the New York state line was planned as a continuation of the Northeast Extension of the

. A new extension of the turnpike between

and Scranton was also proposed. After the

Federal-Aid Highway Act of 1956 The Federal-Aid Highway Act of 1956, also known as the National Interstate and Defense Highways Act, was enacted on June 29, 1956, when President Dwight D. Eisenhower signed the bill into law. With an original authorization of $25 billion (eq ...

was passed, plans were changed to build a free Interstate Highway rather than a toll road. The first section to be built ran from PA 347 in

Dunmore Dunmore from the or , meaning "great fort", may refer to: People * Dunmore (surname) * Earl of Dunmore, a title in the Peerage of Scotland, includes a list of earls * Countess of Dunmore (disambiguation), a list of wives of earls of Dunmore Pl ...

to US 11 in northern Scranton, this section opening in 1960. All of I-81 in Pennsylvania was completed by the 1970s. Construction cost nearly $443 million (equivalent to $ in ). On May 9, 2013, a tanker crashed and caught fire at the interchange between I-81 and US 22/US 322 in Harrisburg. The fire damaged the bridges carrying westbound US 22/US 322 and a ramp over I-81. At least one of those bridges, carrying US 22 eastbound over I-81 and several ramps, and possibly another, the ramp carrying traffic from I-81 northbound to US 22/US 322 westbound, would have to be demolished and replaced. The fire resulted in about of I-81 being closed in both directions, with traffic being diverted along the southern portion of the

. The highway was not fully reopened until the evening of May 13.

Future

Scranton Beltway

On April 28, 2016, plans were announced for a Scranton Beltway to use the Pennsylvania Turnpike Northeast Extension (I-476) as a bypass for I-81 around the heavily congested segment through Scranton and its suburbs. The turnpike between the two I-81 interchanges carries an average of 10,000 vehicles per day versus 80,000 on the parallel segment of I-81. This project will build two high-speed connections between I-476 and I-81: one south of Scranton in

Dupont Dupont, DuPont, Du Pont, duPont, or du Pont may refer to: People * Dupont (surname) Dupont, also spelled as DuPont, duPont, Du Pont, or du Pont is a French surname meaning "of the bridge", historically indicating that the holder of the surname re ...

and one north of Scranton in South Abington Township. Tolls on the connections will be paid with

E-ZPass E-ZPass Interagency Group (E-ZPass Group trade name and E-ZPass product brand) is an electronic toll collection system used on toll roads, toll bridges, and toll tunnels in the eastern half of the United States. The group itself is composed of ...

or toll by plate. Construction of this project is expected to cost $160 million. In 2021, design work on the project resumed, with construction expected to begin in 2025.

New interchange in Chambersburg

On October 24, 2018, the

Pennsylvania Department of Transportation The Pennsylvania Department of Transportation (PennDOT) oversees transportation issues in the Pennsylvania, Commonwealth of Pennsylvania. The administrator of PennDOT is the Pennsylvania Secretary of Transportation, Michael B. Carroll. PennDOT ...

(PennDOT) released their plans for a new exit 12 on I-81, at Guilford Springs Road, estimated to cost around $23 million. The purpose for the exit is to improve access for trucks to the various distribution warehouses south of Chambersburg, such as

Target Target may refer to: Warfare and shooting * Shooting target, used in marksmanship training and various shooting sports ** Bullseye (target), the goal one for which one aims in many of these sports ** Aiming point, in field artille ...

. As such, Guilford Springs Road will be widened to three lanes as a part of this project. PennDOT has started obtaining environmental clearances and will start to seek

rights-of-way A right of way (also right-of-way) is a specific route that people, animals, vehicles, watercraft, or utility lines travel, or the legal status that gives them the right to do so. Rights-of-way in the physical sense include controlled-access h ...

in 2020 from approximately 7-10 properties. PennDOT will look at bids for construction starting in 2023.

Exit list

References

External links