 Pennsylvania Route 318 | ||||
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| Route information | ||||
| Maintained byPennDOT | ||||
| Length | 15.916 mi[1] (25.614 km) | |||
| Major junctions | ||||
| West end |  SR 304 at theOhio state line nearWest Middlesex | |||
| Major intersections |  I-376 in West Middlesex | |||
| East end |  PA 158 inMercer | |||
| Location | ||||
| Country | United States | |||
| State | Pennsylvania | |||
| Counties | Mercer | |||
| Highway system | ||||
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Pennsylvania Route 318 (PA 318) is a 15.9-mile-long (25.6 km)state highway located inMercer County,Pennsylvania. The western terminus is at theOhio state line inShenango Township nearWest Middlesex where the road continues asOhio State Route 304. The eastern terminus is atPA 158 inMercer.
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PA 318 begins at theOhio border inShenango Township, where the road continues west into that state asSR 304. From the state line, the route heads east on two-lane undivided Hubbard-Middlesex Road, passing through areas of farms and woods with some homes. PA 318 reaches an intersection withPA 718 and continues through more forested areas with residences. The route heads into the borough ofWest Middlesex and becomes Main Street, crossing theShenango River into residential and commercial areas. In the center of town, the road crossesPA 18. PA 318 continues past more homes prior to heading back into Shenango Township, where it becomes Mercer West Middlesex Road. The route heads east-northeast through rural areas of residences, reaching an interchange withI-376.[2][3]
Past this interchange, PA 318 continues through areas of farmland and woodland with homes, passing underI-80. The road continues intoLackawannock Township and runs through the communities of Bethel andGreenfield. Upon heading intoEast Lackawannock Township, the route curves south then east, passing through agricultural areas. PA 318 passes through a mix of fields and forests as it turns northeast onto Pulaski Mercer Road. The road makes a curve east and enters the borough ofMercer, where the name becomes West Butler Street. In Mercer, PA 318 passes homes before reaching its eastern terminus atPA 158.[2][3]
The entire route is inMercer County.
| Location | mi[1] | km | Destinations | Notes | |
|---|---|---|---|---|---|
| Shenango Township | 0.000 | 0.000 |  SR 304 west (East Liberty Street) –Hubbard | Western terminus of PA 318 atOhio state line | |
| 1.348 | 2.169 |   PA 718 north (Seig Hill Road) –Wheatland,Sharon | Southern terminus of PA 718 | ||
| West Middlesex | 3.495 | 5.625 |  PA 18 (Sharon Road) | ||
| Shenango Township | 4.279 | 6.886 |   I-376 (Beaver Valley Expressway) toI-80 –Hermitage,Sharon | Exit 1C (I-376), originally westbound entrance to / eastbound exit from I-376 only. Became a full interchange in October 2014.[4] | |
| Mercer | 15.916 | 25.614 | PA 158 (South Shenango Street) | Eastern terminus of PA 318 | |
| 1.000 mi = 1.609 km; 1.000 km = 0.621 mi | |||||
 PA Route 318 Alternate Truck | |
|---|---|
| Location | Mercer County, Pennsylvania |
| Existed | 2013–2018 |
Pennsylvania Route 318 Alternate Truck is atruck route around a weight-restricted bridge over the Little Neshannock Creek on which trucks over 33 tons and combination loads over 39 tons are prohibited. The route follows PA 18,US 62, and PA 158. The route was signed in 2013, but it was decommissioned in 2018 following a bridge repair.[5]
