Interstate 70 in Pennsylvania

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Interstate 70

I-70 highlighted in red
Route information
Maintained by PennDOT and PTC
Length167.92 mi[1] (270.24 km)
NHSEntire route
Major junctions
West end I-70 at the West Virginia state line
Major intersections
East end I-70 / US 522 at the Maryland state line
CountryUnited States
CountiesWashington, Westmoreland, Somerset, Bedford, Fulton
Highway system
PA 69 PA 70
PA 125PA 126 PA 127

Interstate 70 (I-70) in the US state of Pennsylvania runs east–west across the southwest part of the state serving the southern fringe of the Pittsburgh metropolitan area. About half of the route is concurrent with I-76 on the Pennsylvania Turnpike, which is a toll road. This is the oldest segment of I-70 in Pennsylvania, having been completed in 1940, and is only one of two segments of I-70 that are tolled, with the other being the Kansas Turnpike. I-70 is one of only a few Interstate Highways to have a traffic signal—in this case, with U.S. Route 30 (US 30) in Breezewood, where it leaves the Pennsylvania Turnpike and heads toward Maryland.[2]

Route description

Two segments of I-70 in Pennsylvania are not designed to modern Interstate standards: a 37-mile (60 km) segment from Washington to New Stanton and the aforementioned half-mile (0.80 km) signalized segment in Breezewood.

West Virginia to Washington

I-70 enters Pennsylvania from West Virginia, coming into Donegal Township, Washington County. The highway continues northeast as a four-lane freeway with a standard-size median up to Interstate Highway standards through rural areas of woodland and farmland, coming to its first junction at a partial cloverleaf interchange with State Route 3023 (SR 3023), to the southeast of unincorporated village of West Alexander. Past this junction, the freeway begins to parallel US 40 on the northwest side of the road, before it enters a series of winding curves. From here, I-70 heads east to meet a weigh station and a welcome center in the eastbound direction, as well as an interchange with SR 3024 connecting to Pennsylvania Route 231 (PA 231) via US 40 in the borough of Claysville.[3]

I-70 through Buffalo Township in Washington County

The freeway curves to a more east-northeasterly direction, where it briefly passes through the borough limits of Claysville, before briefly reentering Donegal Township. I-70 enters Buffalo Township, where it soon meets a pair of right-in/right-out ramps connecting to PA 221, that serves the unincorporated village of Taylorstown to the northeast, in adjacent Blaine Township. The freeway comes into North Franklin Township before crossing into Canton Township at its partial interchange with US 40 which lacks a westbound entrance; the interchange is adjacent to the Washington Crown Center shopping mall located to the southwest of the interchange. From here, I-70 crosses over an abandoned portion of the Allegheny Valley Railroad's W&P Subdivision line and enters mixed areas of development on the outskirts of the city of Washington, which is also the county seat of Washington County. After passing through an interchange with Sheffield Avenue serving the industrial and commercial area of Jessop Place, the freeway enters the city limits of Washington, where it comes to a pair of right-in/right-out ramps that connect to PA 18. A short distance later, I-70 enters South Strabane Township and reaches its western junction with I-79 at a directional interchange, which heads north toward the city of Pittsburgh.[3]

I-70 (on top) merges with I-79 going through Washington, Pennsylvania, shown in 2008 before reconstruction and flyover construction

The freeway turns southeast through the interchange and begins a concurrency with I-79. A Jersey barrier takes over in the highway's median as it comes to a diverging diamond interchange with US 19 in a commercial area surrounded by strip malls. A short distance later, I-70/I-79 comes to a partial cloverleaf interchange with PA 136 to the northeast of the borough limits of East Washington that provides access to Washington & Jefferson College; a park and ride lot is located in the northeastern corner of the interchange. Past PA 136, the freeway heads back into rural areas with scattered residences, before reaching the eastern split between I-70 and I-79 at a directional interchange. I-79 turns south toward the city of w:Morgantown, West Virginia, while I-70 continues east along the original roadway toward the borough of New Stanton in Westmoreland County.[3]

Washington to New Stanton

East of I-79, I-70 downgrades to a highway substandard of modern Interstate standards. This section of I-70 (old I-70S) has several dated design features. The median narrows to the point that there are no shoulders between the median barrier and the passing lanes on both sides. On- and off-ramps at many of the interchanges are substandard in both length and geometry, which requires vehicles to decelerate in the travel lanes before entering the off-ramps, and also necessitates the use of stop signs on the on-ramps instead of yield signs. Several overpasses do not meet minimum clearance requirements, which has resulted in damage to and from overheight trucks. Total reconstruction efforts are ongoing that will upgrade most of this segment of I-70 and its interchanges to modern Interstate standards, and various projects are scheduled through the early 2020s.

I-70 eastbound approaching the PA 88 exit in Speers

The first interchange that the freeway meets past I-79 is with PA 519, where the route crosses into Somerset Township. I-70 continues through areas of rural farmland with surroundings of wooded rolling hills and turns to the east-southeast, coming to interchanges with SR 1055 south of the hamlet of Dunningsville and McIllvaine Road southeast of the hamlet of Kammerer, in adjacent Nottingham Township, before reaching the borough limits of Bentleyville at the PA 917 interchange, which only contains an eastbound exit and westbound entrance. Shortly afterward, the expressway crosses over Norfolk Southern Railway's Ellsworth Secondary and meets modified right-in/right-out ramps to Wilson Road, which provides complete access to PA 917 and the center of Bentleyville to and from both directions. Following Bentleyville, I-70 enters Fallowfield Township, where it has a complete diamond interchange with PA 481, a westbound exit and eastbound entrance to Twin Bridges Road to the northeast of the hamlet of Lover, and a full cloverleaf interchange with the Mon–Fayette Expressway (PA 43), as the route descends into the valley of the Monongahela River. From here, the expressway curves east-northeast into the borough of Twilight, before crossing into the borough of Speers at the interchange with Maple Drive/Twilight Hollow Road. At this point, I-70 meets PA 88 at a pair of right-in/right-out ramps, prior to crossing over Norfolk Southern Railway's Mon Line, the Monongahela River, and CSX Transportation's Mon Subdivision on the Belle Vernon Bridge, where the route leaves both Speers and Washington County.[3]

Beyond the Belle Vernon Bridge, the route enters Westmoreland County within Rostraver Township. Here, it has a partial cloverleaf interchange with PA 906, before it crosses into the borough of North Belle Vernon and interchanges with Fayette Street, to the northeast of the borough center. From this point, the expressway heads back into Rostraver Township where it meets PA 201 at a partial cloverleaf interchange northeast of the community of Lynnwood-Pricedale that also provides access to PA 837. I-70 continues through wooded areas with nearby development, reaching an interchange with SR 3011 north of the hamlet of Arnold City in adjacent Washington Township, Fayette County, before coming to a cloverleaf interchange with PA 51 as the route begins to enter the valley of the Youghiogheny River. Past PA 51, the route crosses the Smithton High-Level Bridge over the Youghiogheny River and CSX Transportation's Keystone Subdivision, where it enters South Huntingdon Township. From here, I-70 interchanges with SR 3031 north of the borough of Smithton, PA 31 at cloverleaf to the northwest of the Pittsburgh Renaissance Festival grounds, and SR 3010 to the southeast of the unincorporated village of Yukon, before it comes into Sewickley Township. In this area, the expressway has an interchange with Waltz Mill Road to the south of the borough of Madison, before it passes through Hempfield Township prior to entering New Stanton. Within the borough limits, I-70 has a dumbbell interchange with SR 3089, before it exits the mainline expressway at a trumpet interchange, to come to a toll plaza for the New Stanton interchange on the Pennsylvania Turnpike (I-76). At this point, the mainline expressway continues east to a cloverleaf junction between US 119 and the southern terminus of PA 66. I-70 itself passes through the toll plaza and comes to another trumpet interchange, where the Interstate merges onto the eastbound turnpike that heads toward the city of Harrisburg, the state capital of Pennsylvania. In the opposite direction, the Pennsylvania Turnpike heads northwest toward Pittsburgh, then becomes the Ohio Turnpike, which continues towards Cleveland.[3]

Pennsylvania Turnpike concurrency

For 86 miles (138 km) from New Stanton to Breezewood, I-70 shares a concurrency with I-76 along the Pennsylvania Turnpike. I-70 passes through a wind farm in Somerset County and close to the 9/11 Flight 93 National Memorial in Shanksville. It then has an indirect connection to I-99 in Bedford County before reaching the eastern end of its concurrency with the Turnpike in Breezewood.[3]

Breezewood to Maryland

View east along the non-freeway portion of I-70 and west along US 30 in Breezewood

I-70 splits from the Pennsylvania Turnpike at the Breezewood Interchange in East Providence Township, Bedford County. The turnpike continues east toward Harrisburg and Philadelphia, while I-70 passes through another toll plaza and passes under its own carriageways, before downgrading into another highway substandard of Interstate standards, at a partial trumpet interchange with US 30. Eastbound I-70 merges onto westbound US 30 to form a half-mile (0.80 km) wrong-way concurrency through the community of Breezewood. This section of I-70 is one of the few instances of where an Interstate Highway follows a road that lacks grade separation and includes traffic signals. I-70 follows US 30 west along a five-lane highway with a center turn lane through commercial areas in Breezewood before it splits from US 30 and turns left onto another freeway alignment. US 30, meanwhile, continues west toward the borough of Everett.[3]

I-70 westbound past US 522 in Warfordsburg

Beyond US 30, I-70 heads south and becomes a four-lane limited-access freeway that once again conforms to modern Interstate standards. The median widens, before the freeway crosses over its preceding carriageways and under the Pennsylvania Turnpike. Shortly past the turnpike underpass, there is an interchange with South Breezewood Road before I-70 curves to cross Rays Hill, crossing into Fulton County, and coming to a pair of right-in/right-out ramps with the southern terminus of PA 915 in the unincorporated village of Crystal Spring, in Brush Creek Township. The freeway continues through a valley of farmland and comes to an eastbound rest area on the western slope of Town Hill, which the highway crosses at an oblique angle. In the middle of the mountain crossing, I-70 has another pair of right-in/right-out ramps with the northern terminus of PA 643, and then descends along the length of its eastern slope into another rural valley. Within this valley, the freeway enters Union Township, turns generally more southeast and interchanges with the northern terminus of PA 731, east of the unincorporated village of Amaranth.[3]

Past PA 731, I-70 crosses Sideling Hill and comes into Bethel Township. The route heads through forested and mountainous surroundings in the watershed of Tonoloway Creek, before coming to an interchange with the western end of the highway's concurrency with US 522 in the unincorporated town of Warfordsburg. Southbound US 522 merges onto eastbound I-70 and the two routes run concurrent across the Mason–Dixon line into Washington County, Maryland.[3]


Pennsylvania Route 126


Alternate plate 1961.svg

Pennsylvania Route 71 Alternate

LocationWashingtonNew Stanton

By 1947, present I-70 across Pennsylvania was included in the planned Interstate Highway System. The route from West Virginia split at Washington, with one branch heading northeast to meet the Pennsylvania Turnpike near Pittsburgh and the other heading east, bypassing Pittsburgh to the south (via a planned bypass of PA 71) to the New Stanton interchange. The piece south from the Breezewood interchange into Maryland was also in the network.[4] The route between US 30 in Breezewood and US 522 in Warfordsburg was originally known as Pennsylvania Route 126 (PA 126). In 1957, preliminary numbers were assigned; the longer route via Pittsburgh (now I-79 and I-376) became the main line of I-70, while the southern bypass (now I-70) became Interstate 70S (I-70S).[5] The section of present-day I-70 between PA 519 near Washington and New Stanton was built as a four-lane divided highway known as the "Express Highway"; this road was assigned the temporary PA 71 Alternate (PA 71 Alt.) designation in 1957 and would be designated as I-70S following the completion of additional connecting roads in the Interstate Highway System.[6][7] On July 15, 1960, I-70 was designated onto the Penn-Lincoln Parkway.[8] A southern extension of I-79 (which had previously only run from Erie south to Pittsburgh) to Charleston, West Virginia, in 1963 resulted in changes to I-70. On February 26, 1964, as part of the formation of I-76 (east of Downtown Pittsburgh), the American Association of State Highway and Transportation Officials (AASHTO) approved a rerouting of I-70 along I-70S. The former I-70 became I-79 from Washington to downtown Pittsburgh and I-76 to and along the Turnpike to New Stanton.[9] This brought the routing of I-70 to its present form.


In 2011, the Pennsylvania Department of Transportation (PennDOT) began preliminary work for a total reconstruction of I-70 between the West Virginia state line and New Stanton. Approximately $500 million will be spent on this 58-mile (93 km) segment of highway in order to improve it to modern Interstate standards, half of which will be spent redesigning eight interchanges. Other planned improvements include six overpass replacements, a new roadbed, a wider median, electronic ITS signage, and widening the I-70/I-79 concurrency in Washington to six lanes.[10]

Two noteworthy interchange projects will occur in conjunction with the I-70/I-79 widening. Underway is a reconfiguration of the east/south split between I-70 and I-79, which will eliminate the one-lane, low-speed loop ramp from I-79 northbound to I-70 westbound, replacing it with a two-lane, high-speed flyover ramp.[11] Preliminary design work has also been completed for a redesigned interchange between I-70/I-79 and Murtland Avenue (US 19), and involves replacing the existing substandard cloverleaf in favor of the first diverging diamond interchange in Pennsylvania.[12]

Exit list

CountyLocation[13]mi[14]kmOld exit
New exit
WashingtonDonegal Township0.0000.000
I-70 west – Wheeling
Continuation into West Virginia
0.7761.24911West Alexander
To PA 231 – Claysville
Buffalo Township10.96417.645311 PA 221 – Taylorstown
North FranklinCanton
township line
14.94024.044415 US 40 (Chestnut Street)
Canton Township16.02725.793516Jessop Place
Washington16.45126.475617 PA 18 (Jefferson Avenue)
South Strabane Township17.54628.23818
I-79 north – Pittsburgh
Western end of I-79 overlap; I-79 exit 38
18.59729.929719 US 19 (Murtland Avenue)Diverging diamond interchange
18.94530.489820 PA 136 (Beau Street)
I-79 south – Morgantown
Eastern end of I-79 overlap; I-79 exit 34; also signed for Waynesburg
Somerset Township24.64339.659925 PA 519 – Eighty Four, Glyde
Somerset TownshipBentleyville line32.42152.17712A32A PA 917 – Ginger HillEastbound exit and westbound entrance
BentleyvilleFallowfield Township line32.78052.75412B32B
To PA 917 – Bentleyville
Also signed for Ginger Hill at westbound exit
Fallowfield Township35.20156.6511335 PA 481 – Monongahela, Centerville
36.39658.5741436LoverWestbound exit and eastbound entrance
PA Turnpike 43 – California, Pittsburgh
Signed as exits 37A (south) and 37B (north); Brownsville posted on supplemental signage; E-ZPass or toll-by-plate
TwilightSpeers line39.87764.1761639Speers
Speers40.24864.7731740 PA 88 – Charleroi, Allenport
Monongahela River40.69765.495Belle Vernon Bridge
WestmorelandRostraver Township40.77665.6231841 PA 906 – Belle Vernon, MonessenThe eastbound exit and entrance ramps are located partially within the limits of Belle Vernon in Fayette County
North Belle Vernon41.52866.8331942North Belle Vernon
Rostraver Township42.08367.72619A42AMonessenWestbound exit only
PA 201 to PA 837 – Donora, Fayette City
Signed as exits 43A (south) and 43B (north) westbound
44.21671.1592144Arnold City
46.47874.7992246 PA 51 – Uniontown, PittsburghSigned as exits 46A (south) and 46B (north)
South Huntingdon Township48.95778.7892349Smithton
51.25782.4902451 PA 31 – Mount Pleasant, West NewtonSigned as exits 51A (east) and 51B (west)
Sewickley Township53.92386.78125A54Madison
New Stanton56.97891.6972657New Stanton, HunkerRebuilt interchange combining former exits 57B (Hunker) and 57A (New Stanton)
US 119 / PA Turnpike 66 north – Greensburg, Connellsville, Delmont
I-70 exits via exit 58 to toll plaza eastbound; Delmont not signed eastbound
57.76592.964New Stanton Toll Plaza (western end of closed toll system)

I-76 Toll west / Penna Turnpike west – Pittsburgh, Cleveland
Western end of I-76/Penna. Tpk. overlap; I-70 exits turnpike via exit 75 westbound; New Stanton Interchange
Donegal Township73.292117.952991 PA 31 / PA 711 – Ligonier, UniontownDonegal Interchange
SomersetSomerset92.512148.88410110 US 219 – Somerset, JohnstownAccess via PA 601; Somerset Interchange
township line
Allegheny Mountain Tunnel
BedfordBedford Township128.102206.16011146
I-99 north / US 220 – Bedford, Altoona
Access via US 220 Bus.; Bedford Interchange
East Providence Township144.102231.91012161

I-76 Toll east / Penna Turnpike east – Harrisburg
Eastern end of I-76/Penna. Tpk. overlap; I-70 exits turnpike via exit 161 eastbound; Breezewood Interchange
144.402232.392Breezewood Toll Plaza (eastern end of closed toll system)
146.706236.100Eastern end of freeway section

US 30 east – McConnellsburg
Eastern end of US 30 overlap
US 30 west – Breezewood, Everett
Western end of US 30 overlap
Western end of freeway section
148.465238.93129149South BreezewoodNo westbound entrance; signed as US 30 west to Everett westbound
FultonBrush Creek Township150.948242.92730151 PA 915 – Crystal Spring
155.510250.26931156 PA 643 – Town Hill
Union Township163.007262.33432163
PA 731 south – Amaranth
Bethel Township167.724269.92633168
US 522 north – Warfordsburg
Western end of US 522 overlap

I-70 east / US 522 south – Hancock
Continuation into Maryland
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


  1. ^ "Route Log - Main Routes of the Eisenhower National System Of Interstate and Defense Highways - Table 1". Federal Highway Administration. Retrieved October 4, 2014.
  2. ^ Roig-Franzia, Manuel (November 22, 2001). "The Town That Stops Traffic: Travelers Encounter Way Station as Way of Life in Breezewood". The Washington Post.
  3. ^ a b c d e f g h i Google (April 24, 2020). "Overview of Interstate 70 in Pennsylvania" (Map). Google Maps. Google. Retrieved April 24, 2020.
  4. ^ National System of Interstate Highways, August 2, 1947
  5. ^ Official Route Numbering for the National System of Interstate and Defense Highways, August 14, 1957
  6. ^ "'Express Highway' Designated As Alternate Route 71 By PDH". The Daily Republican. Monongahela, PA. March 11, 1959. p. 1. Retrieved August 19, 2015 – via
  7. ^ "Gets Temporary Route Designation". The Daily Courier. Connellsville, Pennsylvania. March 12, 1959. p. 15. Retrieved August 19, 2015 – via
  8. ^ "Designations Of Highways Are Changed". The Evening Standard. Uniontown, Pennsylvania. July 16, 1960. p. 7. Retrieved August 28, 2015 – via
  9. ^ "Was I-76 Numbered to Honor Philadelphia for Independence Day, 1776?". Ask the Rambler. Federal Highway Administration.
  10. ^ "I-70 Projects". I-70 Projects. Retrieved January 29, 2013.
  11. ^ "I-70 Projects List" (PDF). Archived from the original (PDF) on January 22, 2016. Retrieved January 29, 2013.
  12. ^ "PennDOT District 12-0 - Media Release". Pennsylvania Department of Transportation. January 11, 2012. Retrieved January 29, 2013.
  13. ^ "Video Log". Pennsylvania Department of Transportation. Retrieved June 29, 2016.
  14. ^ Bureau of Maintenance and Operations (January 2016). Roadway Management System Straight Line Diagrams (Report) (2015 ed.). Pennsylvania Department of Transportation. Retrieved June 29, 2016.
  15. ^ a b "Pennsylvania Exit Numbering" (PDF). Pennsylvania Department of Transportation. Retrieved October 2, 2007.

External links

Interstate 70
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