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| Interstate 70 Main route of the Interstate Highway System |
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| Maintained by Pennsylvania DOT | |||||||||||||
_map.svg) |
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| Length: | 167.92 mi[1] (270.24 km) | ||||||||||||
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| West end: |  I-70 at the West Virginia state line |
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| Major junctions: |
 I-79 in Washington PA 43 in Fallowfield Twp PA 51 in Rostraver Twp  in New Stanton I-76 in New Stanton US 219 in Somerset via  PA 601  I-99 / US 220 in Bedford   I-76/US 30 in Breezewood US 522 near Warfordsburg |
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| East end: |  I-70 at the Maryland state line |
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>In the U.S. state of Pennsylvania, Interstate 70 runs east-west across the southwest part of the state. About half of the route is concurrent with Interstate 76 along the Pennsylvania Turnpike (this is the oldest segment of I-70 in Pennsylvania, having been completed in 1940). I-70 is one of only a few Interstate Highways to have a traffic signal - in this case, with U.S. Route 30 at Breezewood, where it leaves the Turnpike and heads south towards Maryland.[2] The portion of I-70 between Washington, Pennsylvania and New Stanton, Pennsylvania falls well below modern Interstate Highway standards.
I-70 crosses the Monongahela River on the Belle Vernon Bridge and the Youghiogheny River on the Smithton High Level Bridge.
History
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] 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] 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.[5] This brought the routing of I-70 to its present form.
Exit list
| County | Location | Mile[6] | # | Destinations | Notes |
|---|---|---|---|---|---|
| Washington | Donegal Township | 0.89 | 1 | West Alexander | |
| 5.65 | 6 |  To PA 231 – Claysville |
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| Buffalo Township | 11.00 | 11 |  PA 221 – Taylorstown |
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| North Franklin Township | 14.81 | 15 |  US 40 (Chestnut Street) |
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| Canton Township | 15.96 | 16 | Jessop Place | ||
| Washington | 16.65 | 17 |  PA 18 (Jefferson Avenue) |
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| South Strabane Township | 17.51 | 18 | I-79 north – Pittsburgh |
West end of I-79 overlap | |
| 18.56 | 19 |  US 19 (Murtland Avenue) |
Signed as exits 19A (south) and 19B (north) | ||
| 19.00 | 20 |  PA 136 (Beau Street) |
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| 21.02 | 21 | I-79 south – Morgantown |
East end of I-79 overlap | ||
| Somerset Township | 24.50 | 25 |  PA 519 – Eighty Four, Glyde |
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| 27.42 | 27 | Dunningsville | |||
| 30.50 | 31 | Kammerer | |||
| 32.54 | 32A |  PA 917 – Ginger Hill |
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| Bentleyville | 32.94 | 32B | To PA 917 south – Bentleyville |
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| Fallowfield Township | 35.03 | 35 |  PA 483 – Monongahela, Centerville |
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| 36.43 | 36 | Lover | Westbound exit and eastbound entrance | ||
| 37.46 | 37 |  PA 43 – California, Pittsburgh |
Signed as exits 37A (south) and 37B (north) | ||
| Speers | 39.74 | 39 | Speers | ||
| 40.19 | 40 |  PA 88 – Charleroi, Allenport |
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| Westmoreland | Rostraver Township | 40.72 | 41 |  PA 906 – Belle Vernon, Monessen |
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| North Belle Vernon | 41.46 | 42 | North Belle Vernon | ||
| Rostraver Township | 42.13 | 42A | Monessen | Westbound exit and eastbound entrance | |
| 42.64 | 43 |   PA 201 to PA 837 (via Donora-Monessen Bridge) – Donora, Fayette City |
Signed as exits 43A (south) and 43B (north) westbound | ||
| 44.10 | 44 | Arnold City | |||
| 46.36 | 46A |  PA 51 – Uniontown, Pittsburgh |
Signed as exits 46A (south) and 46B (north) | ||
| South Huntingdon Township | 48.85 | 49 | Smithton | ||
| 51.13 | 51A |  PA 31 – Mt. Pleasant, West Newton |
Signed as exits 51A (east) and 51B (west) | ||
| 53.19 | 53 | Yukon | |||
| Sewickley Township | 53.82 | 54 | Madison | ||
| New Stanton | 56.87 | 57A | Hunker | Westbound exit and eastbound entrance | |
| 56.95 | 57B | New Stanton | Signed as exit 57 eastbound | ||
| 57.32 |   To US 119 / PA 66 north – Greensburg, Connellsville, Delmont |
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 I-76 west / Penna. Tpk. west – Pittsburgh, Cleveland |
West end of I-76 overlap | ||||
| Donegal | 91 |  PA 31 / PA 711 – Ligonier, Uniontown |
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| Somerset | Somerset | 110 |  US 219 – Johnstown, Somerset |
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| Bedford | Bedford | 146 | I-99 / US 220 – Bedford, Altoona, Johnstown |
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| East Providence Township | I-76 east / Penna. Tpk. east – Harrisburg |
East end of I-76 overlap | |||
| East end of freeway | |||||
 US 30 east – McConnellsburg, Chambersburg, Gettysburg |
West end of US 30 overlap | ||||
| 147.05 | US 30 west – Everett |
East end of US 30 overlap; at-grade intersection | |||
| West end of freeway | |||||
| Fulton | 148.68 | 149 | To US 30 west – Everett, South Breezewood |
No westbound entrance | |
| Brush Creek Township | 151.16 | 151 |  PA 915 – Crystal Spring |
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| 155.75 | 156 |  PA 643 – Town Hill |
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| Union Township | 163.21 | 163 |  PA 731 south – Amaranth |
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| Bethel Township | 167.93 | 168 |  US 522 north – Warfordsburg |
West end of US 522 overlap | |
References
- ^ Route Log - Main Routes of the Eisenhower National System Of Interstate and Defense Highways - Table 1
- ^ Manuel Roig-Franzia, "The Town That Stops Traffic: Travelers Encounter Way Station as Way of Life in Breezewood," Washington Post, 22 November 2001, B1.
- ^ National System of Interstate Highways, August 2, 1947
- ^ Official Route Numbering for the National System of Interstate and Defense Highways, August 14, 1957
- ^ Ask the Rambler, Was I-76 Numbered to Honor Philadelphia for Independence Day, 1776?
- ^ Calculated using DeLorme Street Atlas USA 2007 software
| Interstate 70 |
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| Previous state: West Virginia |
Pennsylvania | Next state: Maryland |
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