Interstate 70 in Pennsylvania

Interstate 70
I-70 highlighted in red
Route information
Maintained by PennDOT and PTC
Length	167.92 mi[1] (270.24 km)
Major junctions
West end	I‑70 at the West Virginia state line
	I-79 / US 40 / US 19 / PA 18 in Washington PA Turnpike 43 in Fallowfield Township PA 51 in Rostraver Township I-76 / Penna Turnpike / US 119 / PA Turnpike 66 in New Stanton US 219 near Somerset I-99 / US 30 / US 220 in Bedford I-76 / Penna Turnpike / US 30 in Breezewood US 522 near Warfordsburg
East end	I-70 / US 522 at the Maryland state line
Location
Counties	Washington, Westmoreland, Somerset, Bedford, Fulton
Highway system
Interstate Highway System Main Auxiliary Suffixed Business Future Pennsylvania State Route System Interstate US State Scenic Byways Legislative ← PA 69 PA 70 → ← PA 125 PA 126 PA 127 →

In the U.S. state of Pennsylvania, Interstate 70 (I-70) 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 Interstate 76 on the Pennsylvania Turnpike. 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 Turnpike and heads toward Maryland.^[2]

Route description

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

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

For 37 miles between the eastern end of its concurrency with I-79 in Washington and the western end of its concurrency with the Pennsylvania Turnpike in New Stanton, I-70 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.

Interstate 70 through Buffalo Township in Washington County, Pennsylvania

I-70 crosses the Monongahela River on the Speers-Belle Vernon Bridge and the Youghiogheny River on the Smithton High Level Bridge. In New Stanton, I-70 exits the main highway alignment to merge with the Pennsylvania Turnpike (I-76). The main alignment itself continues as a very short spur with no route number, then picks up U.S. 119 at an interchange with PA 66.

For 86 miles 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 intersects I-99 in Bedford County before reaching the eastern end of its concurrency with the Turnpike in Breezewood.

In Breezewood, I-70 exits the Pennsylvania Turnpike and begins a half-mile wrong-way concurrency with U.S. 30. This is the other segment of the highway in Pennsylvania that is not designed to Interstate standards since it lacks grade separation and access control. I-70 then takes a north/south alignment between Breezewood and the Maryland state line, with the eastern terminus of I-68 less than a mile past the state line near Hancock. U.S. 522 also forms a four-mile concurrency with I-70 between Warfordsburg (Pa.) and Hancock (Md.).

History

PA Route 71 Alternate
Location	Washington–New Stanton
Existed	1957–1963

By 1947, present Interstate 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 Pennsylvania Route 71) to the New Stanton interchange. The piece south from the Breezewood interchange into Maryland was also in the network.^[3] The route between US 30 in Breezewood and US 522 in Warfordsburg was originally known as Pennsylvania Route 126. In 1957, preliminary numbers were assigned; the longer route via Pittsburgh (now Interstate 79 and Interstate 376) became the main line of I-70, while the southern bypass (now I-70) became Interstate 70S.^[4] 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 designation in 1957 and would be designated as I-70S following the completion of additional connecting roads in the Interstate Highway System.^[5][6] On July 15, 1960, I-70 was designated onto the Penn-Lincoln Parkway.^[7] A southern extension of Interstate 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 Interstate 76 (east of downtown Pittsburgh), 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.^[8] This brought the routing of I-70 to its present form.

Future

In 2011, 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 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.^[9]

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.^[10] Preliminary design work has also been completed for a redesigned interchange between I-70/I-79 and Murtland Avenue (U.S. 19), and involves replacing the existing substandard cloverleaf in favor of the first diverging diamond interchange in Pennsylvania.^[11]

Exit list

County	Location[12]	mi[13]	km	Old exit [14]	New exit [14]	Destinations	Notes
Washington	Donegal Township	0.000	0.000	–	–	I‑70 west – Wheeling	Continuation into West Virginia
		0.776	1.249	1	1	West Alexander
		5.648	9.090	2	6	To PA 231 – Claysville
	Buffalo Township	10.964	17.645	3	11	PA 221 – Taylorstown
	North Franklin–Canton township line	14.940	24.044	4	15	US 40 (Chestnut Street)
	Canton Township	16.027	25.793	5	16	Jessop Place
	Washington	16.451	26.475	6	17	PA 18 (Jefferson Avenue)
	South Strabane Township	17.546	28.238	–	18	I-79 north – Pittsburgh	Western end of I-79 overlap; exit 38 southbound
		18.597	29.929	7	19	US 19 (Murtland Avenue)	Diverging diamond interchange
		18.945	30.489	8	20	PA 136 (Beau Street)
		21.083	33.930	–	21	I-79 south – Morgantown	Eastern end of I-79 overlap; exit 34 northbound; also signed for Waynesburg
	Somerset Township	24.643	39.659	9	25	PA 519 – Eighty Four, Glyde
		27.503	44.262	10	27	Dunningsville
		30.592	49.233	11	31	Kammerer
	Somerset Township–Bentleyville line	32.421	52.177	12A	32A	PA 917 – Ginger Hill	No eastbound entrance
	Bentleyville–Fallowfield Township line	32.780	52.754	12B	32B	To PA 917 south – Bentleyville
	Fallowfield Township	35.201	56.651	13	35	PA 481 – Monongahela, Centerville
		36.396	58.574	14	36	Lover	Westbound exit and eastbound entrance
		37.555– 37.571	60.439– 60.465	15A	37A	PA Turnpike 43 south – California	Brownsville posted on supplemental signage
				15B	37B	PA Turnpike 43 north – Pittsburgh
	Twilight–Speers line	39.877	64.176	16	39	Speers
	Speers	40.248	64.773	17	40	PA 88 – Charleroi, Allenport
Monongahela River		40.697	65.495	Belle Vernon Bridge
Westmoreland	Rostraver Township	40.776	65.623	18	41	PA 906 – Belle Vernon, Monessen
	North Belle Vernon	41.528	66.833	19	42	North Belle Vernon
	Rostraver Township	42.083	67.726	19A	42A	Monessen	Westbound exit only
		42.742	68.787	20	43	PA 201 to PA 837 – Donora, Fayette City	Signed as exits 43A (south) and 43B (north) westbound
		44.216	71.159	21	44	Arnold City
		46.478	74.799	22A	46A	PA 51 south – Uniontown
				22B	46B	PA 51 north – Pittsburgh
	South Huntingdon Township	48.957	78.789	23	49	Smithton
		51.257	82.490	24A	51A	PA 31 east – Mount Pleasant
				24B	51B	PA 31 west – West Newton
		53.203	85.622	25	53	Yukon
	Sewickley Township	53.923	86.781	25A	54	Madison
	New Stanton	56.978	91.697	26A & 26B	57	New Stanton	Rebuilt interchange combining former exits 57B (Hunker) and 57A (New Stanton)
		57.564	92.640	–	–	US 119 / PA Turnpike 66 north – Greensburg, Connellsville, Delmont	I-70 exits itself to toll plaza eastbound; Delmont not signed eastbound
				Western end of toll road
				–	–	I-76 west / Penna Turnpike west – Pittsburgh	Western end of I-76/Penna. Tpk. overlap; I-70 exits turnpike via exit 75 westbound; New Stanton Interchange
	Donegal			9	91	PA 31 / PA 711 – Ligonier, Uniontown	Donegal Interchange
	Somerset			10	110	US 219 – Somerset, Johnstown	Somerset Interchange
Stonycreek–Allegheny township line				Allegheny Mountain Tunnel
Bedford	Bedford Township			11	146	I-99 / US 220 – Bedford, Altoona, Johnstown	I-99/US 220 exit 1; Bedford Interchange
	East Providence Township			–	–	I-76 east / Penna Turnpike east – Harrisburg	Eastern end of I-76/Penna. Tpk. overlap; I-70 exits turnpike via exit 161 eastbound; Breezewood Interchange
				East end of toll road
		146.706	236.100	Western end of non-freeway section
				–	–	US 30 east – McConnellsburg, Chambersburg, Gettysburg	Eastern end of US 30 overlap; McConnellsburg signed westbound, Chambersburg and Gettysburg signed eastbound
		147.000	236.574	–	–	US 30 west – Breezewood, Everett	Western end of US 30 overlap
				Eastern end of non-freeway section
		148.465	238.931	29	149	South Breezewood	No westbound entrance
Fulton	Brush Creek Township	150.948	242.927	30	151	PA 915 – Crystal Spring
		155.510	250.269	31	156	PA 643 – Town Hill
	Union Township	163.007	262.334	32	163	PA 731 south – Amaranth
	Bethel Township	167.724	269.926	33	168	US 522 north – Warfordsburg	Western end of US 522 overlap
		170.281	274.041	–	–	I-70 east / US 522 south – Hancock	Continuation into Maryland
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus       Incomplete access       Tolled

See also

• U.S. Roads portal
• Pennsylvania portal
• Pittsburgh portal

References

Route map:

Interstate 70
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