Pennsylvania Route 18
Encyclopedia
Pennsylvania Route 18 is a major north–south highway in Western Pennsylvania
whose southern terminus is at the West Virginia
state line in Greene County, Pennsylvania
near the village of Garrison, while the northern terminus is at PA Route 5 in Lake City, Pennsylvania
. At a length of 205 miles (329.9 km), PA Route 18 is one of the few state routes in Pennsylvania
– north–south or east–west – to traverse the entire state. It also has the distinction of being one of the longest state routes in Pennsylvania.
state line, Route 18 winds through rural Greene County
, passing through the villages of Garrison, New Freeport, Nettle Hill, White Cottage, Woodruff, and Holbrook, before making its first junction with another state highway, PA Route 21
, just west of the village of Rogersville and over 15 miles (24.1 km) from the state line. Here the two routes overlap for nearly 6 miles (9.7 km), winding east-northeast through Rogersville and the village of East View, crossing the South Fork of Ten Mile Creek numerous times before reaching the village of West Waynesburg. At this point, Route 18 leaves the concurrency and turns northwest, traveling 12 miles (19.3 km) to the county line, following along Browns Creek, and passing through the villages of Rees Mill, Sycamore, and Nineveh.
, and intersects with the eastern terminus of PA Route 231
and turns to the northeast and traveling over 5 miles (8 km), passing near the villages of Old Concord and Sparta. Next, the route meets PA Route 221
, and the two overlap for just over a mile, heading northwest through the village of Prosperity. After the village, Route 18 leaves the concurrency and heads northward through the villages of Van Buren, Lagonda, and Gabby Heights as it approaches the city of Washington
nearly 10 miles (16.1 km) later. In Washington, Route 18 briefly overlaps with US 40
, and the routes head west, intersect with the western terminus of PA Route 136
, and then turn northwest. US 40 then leaves the concurrency, and nearly a mile later, Route 18 interchanges with I-70, connecting via city streets to the entrance and exit ramps. Before departing the city, 0.4 mile (0.643736 km) later, the route intersects with the eastern terminus of PA Route 844
, turns northward, and passes through the village of Oak Grove. Route 18 passes through the village of Gretna 8.5 miles (13.7 km) later and then overlaps with PA Route 50
for 0.5 mile (0.80467 km) a couple miles west of the village of Hickory before continuing north-northwest. The route then passes by the village of Atlasburg and through the village of Slovan before reaching the borough of Burgettstown
7.5 miles (12.1 km) later. Route 18 meets US 22
nearly 4 miles (6.4 km) north of the borough, and then passes through the village of Florence at Old US 22 before reaching the county line just over 3 miles (4.8 km) later.
The route enters the borough of Frankfort Springs
as it enters Beaver County
, and meets the southern terminus of PA Route 168
at the north end of the borough. Passing through nearly 5 miles (8 km) of state park land, Route 18 eventually meets US 30
in the village of Harshaville. The route then junctions with PA Route 151
at the village of Mechanicsburg about 1.5 miles (2.4 km) later, and then passes through the village of McCleary. As Route 18 approaches the Ohio River
, it turns east-northeast before its first interchange with I-376
about 2 miles (3.2 km) west of the borough of Monaca
. The route enters the borough, turns north-northwest, crosses the Ohio River on the Rochester-Monaca Bridge, and enters the borough of Rochester
. In Rochester, Route 18 intersects with the PA Route 51
/PA Route 65
overlap, and then PA Route 68
before turning northwest, west, then north-northwest. It then merges with PA Route 65 along the east bank of the Beaver River. The concurrency enters the borough of New Brighton
, where Route 18 then leaves the concurrency over 2 miles (3.2 km) later, crosses the Beaver River
, enters the city of Beaver Falls
, and continues northward almost 2 miles (3.2 km). Route 18 briefly joins with PA Route 588
, and then intersects with the southern terminus of PA Route 551
2 miles (3.2 km) later, just before leaving the city and entering the borough of Big Beaver
. The route then passes through the borough of Homewood
about 1.5 miles (2.4 km) later, and re-enters Big Beaver, where it interchanges with I-76 and The Pennsylvania Turnpike
. Route 18 then passes through the borough of Koppel
nearly 1.5 miles (2.4 km) later, where it intersects with PA Route 351
, and then re-enters Big Beaver a third time before leaving Beaver County 1.3 miles (2.1 km) later.
, it also enters the borough of New Beaver
. Route 18 then turns northwestward, and passes through the borough of Wampum
2 miles (3.2 km) later, where it intersects with the western terminus of PA Route 288
. The route re-enters New Beaver, then turns northward before its second intersection with PA Route 168
over 3.5 miles (5.6 km) later, near the village of Moravia. Route 18 enters the city of New Castle
nearly 4 miles (6.4 km) later as it crosses the Mahoning River
, and then meets PA Route 108
. The two join and turn east, then northeast through the village of Mahoningtown, situated between the Mahoning and Shenango
rivers. The concurrency then passes under US 422 about 0.8 miles (1.3 km) later before turning eastward and crossing the Shenango River. The concurrency then intersects 1.3 miles (2.1 km) later with PA Route 168, and the three routes overlap for 0.9 miles (1.4 km), heading northward. Routes 108 and 168 then leave the concurrency, and Route 18 continues northward. The route is then joined with Business US 422 near downtown New Castle for nearly 0.5 mile (0.80467 km). Business US 422 then leaves westward and Route 18 continues northward out of the city. Route 18 passes through the village of Walmo, and then intersects 4 miles (6.4 km) north of New Castle with Mitchell Rd., which carries traffic to I-376
parallel to and west of Route 18. Over 1.6 miles (2.6 km) later, the route intersects with the southern terminus of PA 158
south of the borough of New Wilmington
, and 2.3 miles (3.7 km) later with PA 208
west of the borough just before exiting Lawrence County 0.5 mile (0.80467 km) north of the intersection.
, the route winds northwesterly a few miles before turning west, where it has its second interchange with I-376 4.5 miles (7.2 km) later. Route 18 then turns northwesterly again, intersecting with the northern terminus of PA Route 551
0.4 mile (0.643736 km) later, and enters the borough of West Middlesex
a mile after that. Here, the route intersects with PA Route 318
. Turning northward, the route then passes under I-80 and has an interchange with PA Route 760
immediately after (Route 18 traffic interchanges with I-80 via this PA Route 760 interchange). Route 18 then enters the city of Hermitage
, intersects with the southern terminus of PA Route 518
a mile north of PA Route 760 at the village of Bobby’s Corners, and continues about 2 miles (3.2 km) before intersecting with US 62
and then Business US 62 less than 0.3 mile (0.482802 km) later. Over 1.5 miles (2.4 km) after that, the route intersects with the northern terminus of PA Route 518 at the village of Lamont’s Corners east of the borough of Sharpsville
before leaving Hermitage. The route enters the borough of Clark
about 2.2 miles (3.5 km) later, where it intersects with the northern terminus of PA Route 258
. Route 18 then crosses the Shenango River
Reservoir, then passes near the villages of Transfer, Reynolds Heights, and Shenango before entering the borough of Greenville
8 miles (12.9 km) north of Clark. In Greenville, Route 18 intersects with the northern terminus of PA Route 846
just before its junction with PA Route 358
. Here, the two routes overlap, heading eastward, and cross the Shenango River
once again, before intersecting about 0.5 mile (0.80467 km) later with PA Route 58
, which joins the concurrency for about a quarter mile. Routes 18 and 58 then leave Route 358 and head northward. Less than a half mile later, Route 18 leaves the concurrency, turning northeastward, then northward, leaving Greenville. The Route continues through rural northern Mercer County about 4.5 miles (7.2 km) before passing through the village of Osgood, and leaves Mercer County less than a mile later.
, Route 18 then passes through the village of Adamsville about 2 miles (3.2 km) north of the county line, and, over 2.5 miles (4 km) later, enters the village of Hartstown, where it joins US 322
, heading east-northeast. They travel over 5 miles (8 km) to the borough of Conneaut Lake
, where they serve Conneaut Lake Park
and join with US 6
/PA Route 285
, heading east. Route 285 leaves the concurrency one block later, and the remaining routes continue eastward out of the borough, nearly a mile later, where Route 18 then leaves the concurrency and heads northward. About 3.5 miles (5.6 km) north of the borough, Route 18 intersects with the northern terminus of PA Route 618
near Conneaut Lake Park
, and then passes through the village of Harmonsburg. About 7.5 miles (12.1 km) later, the route is joined by PA Route 198
, and the concurrency enters the borough of Conneautville
. In the borough, Route 198 leaves the concurrency nearly 0.9 miles (1.4 km) later, and Route 18 continues northward, passing through the borough of Springboro
just over 3 miles (4.8 km) north of Conneautville.
, and enters the borough of Albion
nearly 3 miles (4.8 km) later. Here, Route 18 joins US 6N eastward about 1.5 miles (2.4 km), leaving the borough, where Route 18 turns northward. A mile later, the route passes through the borough of Cranesville
, and then enters the borough of Platea
about 3 miles (4.8 km) later, where it interchanges with I-90. Just over 2 miles (3.2 km) northward, Route 18 joins US 20 eastward into the borough of Girard
for 1 miles (1.6 km), before leaving the concurrency and turning northward. Upon exiting Girard, the route enters the borough of Lake City
, where it terminates at PA Route 5
near the shore of Lake Erie
.
Western Pennsylvania
Western Pennsylvania consists of the western third of the state of Pennsylvania in the United States. Pittsburgh is the largest city in the region, with a metropolitan area population of about 2.4 million people, and serves as its economic and cultural center. Erie, Altoona, and Johnstown are its...
whose southern terminus is at the West Virginia
West Virginia
West Virginia is a state in the Appalachian and Southeastern regions of the United States, bordered by Virginia to the southeast, Kentucky to the southwest, Ohio to the northwest, Pennsylvania to the northeast and Maryland to the east...
state line in Greene County, Pennsylvania
Greene County, Pennsylvania
-Demographics:As of the census of 2000, there were 40,672 people, 15,060 households, and 10,587 families residing in the county. The population density was 71 people per square mile . There were 16,678 housing units at an average density of 29 per square mile...
near the village of Garrison, while the northern terminus is at PA Route 5 in Lake City, Pennsylvania
Lake City, Pennsylvania
Lake City is a borough in Erie County, Pennsylvania, United States. The population was 2,811 at the 2000 census. It is part of the Erie Metropolitan Statistical Area.-Geography:Lake City is located at ....
. At a length of 205 miles (329.9 km), PA Route 18 is one of the few state routes in Pennsylvania
Pennsylvania
The Commonwealth of Pennsylvania is a U.S. state that is located in the Northeastern and Mid-Atlantic regions of the United States. The state borders Delaware and Maryland to the south, West Virginia to the southwest, Ohio to the west, New York and Ontario, Canada, to the north, and New Jersey to...
– north–south or east–west – to traverse the entire state. It also has the distinction of being one of the longest state routes in Pennsylvania.
Greene County
Traveling northward from the West VirginiaWest Virginia
West Virginia is a state in the Appalachian and Southeastern regions of the United States, bordered by Virginia to the southeast, Kentucky to the southwest, Ohio to the northwest, Pennsylvania to the northeast and Maryland to the east...
state line, Route 18 winds through rural Greene County
Greene County, Pennsylvania
-Demographics:As of the census of 2000, there were 40,672 people, 15,060 households, and 10,587 families residing in the county. The population density was 71 people per square mile . There were 16,678 housing units at an average density of 29 per square mile...
, passing through the villages of Garrison, New Freeport, Nettle Hill, White Cottage, Woodruff, and Holbrook, before making its first junction with another state highway, PA Route 21
Pennsylvania Route 21
Pennsylvania Route 21 is a long east–west state highway in the US state of Pennsylvania. The western terminus of the route is at the West Virginia state line in Richhill Township, where PA 21 continues into West Virginia as West Virginia Route 891. The eastern terminus is at U.S. Route 40...
, just west of the village of Rogersville and over 15 miles (24.1 km) from the state line. Here the two routes overlap for nearly 6 miles (9.7 km), winding east-northeast through Rogersville and the village of East View, crossing the South Fork of Ten Mile Creek numerous times before reaching the village of West Waynesburg. At this point, Route 18 leaves the concurrency and turns northwest, traveling 12 miles (19.3 km) to the county line, following along Browns Creek, and passing through the villages of Rees Mill, Sycamore, and Nineveh.
Washington County
Route 18 enters Washington CountyWashington County, Pennsylvania
-Government and politics:As of November 2008, there are 152,534 registered voters in Washington County .* Democratic: 89,027 * Republican: 49,025 * Other Parties: 14,482...
, and intersects with the eastern terminus of PA Route 231
Pennsylvania Route 231
Pennsylvania Route 231 is an long state highway located in Washington county in Pennsylvania. The southern terminus is at PA 18 near Old Concord. The northern terminus is at PA 50 in Avella.-Route description:...
and turns to the northeast and traveling over 5 miles (8 km), passing near the villages of Old Concord and Sparta. Next, the route meets PA Route 221
Pennsylvania Route 221
Pennsylvania Route 221 is an long state highway located in Greene and Washington counties in Pennsylvania. The southern terminus is at PA 188 near Jefferson. The northern terminus is at PA 231 in Acheson.-Greene County:...
, and the two overlap for just over a mile, heading northwest through the village of Prosperity. After the village, Route 18 leaves the concurrency and heads northward through the villages of Van Buren, Lagonda, and Gabby Heights as it approaches the city of Washington
Washington, Pennsylvania
Washington is a city in and the county seat of Washington County, Pennsylvania, United States, within the Pittsburgh Metro Area in the southwestern part of the state...
nearly 10 miles (16.1 km) later. In Washington, Route 18 briefly overlaps with US 40
U.S. Route 40
U.S. Route 40 is an east–west United States highway. As with most routes whose numbers end in a zero, U.S. 40 once traversed the entire United States. It is one of the original 1920s U.S. Highways, and its first termini were San Francisco, California, and Atlantic City, New Jersey...
, and the routes head west, intersect with the western terminus of PA Route 136
Pennsylvania Route 136
Pennsylvania Route 136 is a long state highway located in Washington, Allegheny, and Westmoreland counties in Pennsylvania. The western terminus is at US 40 & PA 18 in Washington...
, and then turn northwest. US 40 then leaves the concurrency, and nearly a mile later, Route 18 interchanges with I-70, connecting via city streets to the entrance and exit ramps. Before departing the city, 0.4 mile (0.643736 km) later, the route intersects with the eastern terminus of PA Route 844
Pennsylvania Route 844
Pennsylvania Route 844 is a long state highway located in Washington county in Pennsylvania. The western terminus is the West Virginia state line in Independence Township where the road becomes WV 27. The eastern terminus is at PA 18 in Washington.The entire stretch of PA Route 844 originally...
, turns northward, and passes through the village of Oak Grove. Route 18 passes through the village of Gretna 8.5 miles (13.7 km) later and then overlaps with PA Route 50
Pennsylvania Route 50
Pennsylvania Route 50 is a long state highway located in western Pennsylvania. The western terminus of the route is at Pennsylvania Route 844 in the Independence Township community of Independence less than a mile from the West Virginia state line. The eastern terminus is at Pennsylvania Route 60...
for 0.5 mile (0.80467 km) a couple miles west of the village of Hickory before continuing north-northwest. The route then passes by the village of Atlasburg and through the village of Slovan before reaching the borough of Burgettstown
Burgettstown, Pennsylvania
Burgettstown is a borough in Washington County, Pennsylvania, United States. It is a suburb of Pittsburgh, Pennsylvania. The population was 1,576 according to the 2000 census.-History:...
7.5 miles (12.1 km) later. Route 18 meets US 22
U.S. Route 22
U.S. Route 22 is a west–east route and is one of the original United States highways of 1926, running from Cincinnati, Ohio, at US 27, US 42, US 127, and US 52 to Newark, New Jersey, at U.S. Route 1/9 near the Newark Liberty International Airport.US 22 also carries the names of the William...
nearly 4 miles (6.4 km) north of the borough, and then passes through the village of Florence at Old US 22 before reaching the county line just over 3 miles (4.8 km) later.
Beaver County
Frankfort Springs, Pennsylvania
Frankfort Springs is a borough in Beaver County, Pennsylvania, United States. The population was 130 at the 2000 census.-Geography:Frankfort Springs is located at ....
as it enters Beaver County
Beaver County, Pennsylvania
-Demographics:As of the census of 2000, there were 181,412 people, 72,576 households, and 50,512 families residing in the county. The population density was 418 people per square mile . There were 77,765 housing units at an average density of 179 per square mile...
, and meets the southern terminus of PA Route 168
Pennsylvania Route 168
Pennsylvania Route 168 is a highway in Western Pennsylvania that runs for from Pennsylvania Route 18 in Frankfort Springs to Pennsylvania Route 208 in Volant...
at the north end of the borough. Passing through nearly 5 miles (8 km) of state park land, Route 18 eventually meets US 30
U.S. Route 30
U.S. Route 30 is an east–west main route of the system of United States Numbered Highways, with the highway traveling across the northern tier of the country. It is the third longest U.S. route, after U.S. Route 20 and U.S. Route 6. The western end of the highway is at Astoria, Oregon; the...
in the village of Harshaville. The route then junctions with PA Route 151
Pennsylvania Route 151
Pennsylvania Route 151 is an long state highway located in Beaver County, Pennsylvania. The western terminus of the route is at US 30 near Harshaville. The eastern terminus is at PA 51 in South Heights...
at the village of Mechanicsburg about 1.5 miles (2.4 km) later, and then passes through the village of McCleary. As Route 18 approaches the Ohio River
Ohio River
The Ohio River is the largest tributary, by volume, of the Mississippi River. At the confluence, the Ohio is even bigger than the Mississippi and, thus, is hydrologically the main stream of the whole river system, including the Allegheny River further upstream...
, it turns east-northeast before its first interchange with I-376
Interstate 376
Interstate 376 is a major auxiliary route of the Interstate Highway System in the U.S. state of Pennsylvania, located entirely within the Allegheny Plateau. It runs from I-80 near Sharon south and east to a junction with the Pennsylvania Turnpike in Monroeville, after having crossed the Turnpike...
about 2 miles (3.2 km) west of the borough of Monaca
Monaca, Pennsylvania
Monaca is a borough in Beaver County, Pennsylvania, United States along the Ohio River, northwest of Pittsburgh. Monaca was first incorporated as Phillipsburg in 1840, and had been known by that name since the 1820s. In 1892, the name of the borough was changed to Monaca in honor of the Native...
. The route enters the borough, turns north-northwest, crosses the Ohio River on the Rochester-Monaca Bridge, and enters the borough of Rochester
Rochester, Pennsylvania
Rochester is a borough in Beaver County, Pennsylvania, United States. Located northwest of Pittsburgh, it is part of the Pittsburgh metropolitan area. The population was 4,014 at the 2000 census....
. In Rochester, Route 18 intersects with the PA Route 51
Pennsylvania Route 51
Pennsylvania Route 51 is a major state highway in Western Pennsylvania. It runs for from Uniontown to the Ohio state line near Darlington, where it connects with Ohio State Route 14. Route 51 is the termination point for Pennsylvania Route 43, Pennsylvania Route 48 and Pennsylvania Route 88. ...
/PA Route 65
Pennsylvania Route 65
Pennsylvania Route 65 is a major state highway located in western Pennsylvania, United States. The route, traveling north–south from the Interstate 279/U.S...
overlap, and then PA Route 68
Pennsylvania Route 68
Pennsylvania Route 68 is a long east–west state highway located in western Pennsylvania in the United States. The western terminus of the route is at the Ohio state line west of Glasgow, where PA 68 continues into Ohio as State Route 39. The eastern terminus is at U.S...
before turning northwest, west, then north-northwest. It then merges with PA Route 65 along the east bank of the Beaver River. The concurrency enters the borough of New Brighton
New Brighton, Pennsylvania
New Brighton is a borough in Beaver County, Pennsylvania, United States, located along the Beaver River northwest of Pittsburgh. There are deposits of coal and clay in the vicinity. In the past, articles produced here included pottery, bricks, sewer pipe, glass, flour, twine, lead kegs,...
, where Route 18 then leaves the concurrency over 2 miles (3.2 km) later, crosses the Beaver River
Beaver River (Pennsylvania)
The Beaver River is a tributary of the Ohio River in Western Pennsylvania in the United States with a length of approximately 21 mi . It flows through a historically important coal-producing region north of Pittsburgh...
, enters the city of Beaver Falls
Beaver Falls, Pennsylvania
Beaver Falls is a city in Beaver County, Pennsylvania, United States. The population was 8,987 at the 2010 census. It is located 31 miles northwest of Pittsburgh, and on the Beaver River, six miles from its confluence with the Ohio River...
, and continues northward almost 2 miles (3.2 km). Route 18 briefly joins with PA Route 588
Pennsylvania Route 588
Pennsylvania Route 588 is an east–west state highway in the Western Pennsylvania counties of Beaver and Butler. It travels sixteen miles between PA 51 in Chippewa Township, Beaver County and PA 288 in Zelienople...
, and then intersects with the southern terminus of PA Route 551
Pennsylvania Route 551
Pennsylvania Route 551 is an long state highway located in Beaver, Lawrence, and Mercer counties in Pennsylvania. The southern terminus is at PA 18 in Beaver Falls...
2 miles (3.2 km) later, just before leaving the city and entering the borough of Big Beaver
Big Beaver, Pennsylvania
Big Beaver is a borough in Beaver County, Pennsylvania, United States. The population was 2,186 at the 2000 census.-Geography:Big Beaver is located at ....
. The route then passes through the borough of Homewood
Homewood, Pennsylvania
Homewood is a borough in Beaver County, Pennsylvania, United States. The population was 147 at the 2000 census.-Geography:Homewood is located at ....
about 1.5 miles (2.4 km) later, and re-enters Big Beaver, where it interchanges with I-76 and The Pennsylvania Turnpike
Pennsylvania Turnpike
The Pennsylvania Turnpike is a toll highway system operated by the Pennsylvania Turnpike Commission in the Commonwealth of Pennsylvania, United States. The three sections of the turnpike system total . The main section extends from Ohio to New Jersey and is long...
. Route 18 then passes through the borough of Koppel
Koppel, Pennsylvania
Koppel is a borough in Beaver County, Pennsylvania, United States. The population was 856 at the 2000 census.-Geography:Koppel is located at ....
nearly 1.5 miles (2.4 km) later, where it intersects with PA Route 351
Pennsylvania Route 351
Pennsylvania Route 351 is an long state highway located in Lawrence and Beaver counties in Pennsylvania. The western terminus is at the Ohio border near S.N.P.J. The eastern terminus is at PA 65/PA 288 in Ellwood City.-Route description:...
, and then re-enters Big Beaver a third time before leaving Beaver County 1.3 miles (2.1 km) later.
Lawrence County
As the route enters Lawrence CountyLawrence County, Pennsylvania
Lawrence County is a county located in the U.S. state of Pennsylvania. In 2010, its population was 91,108. The county was added to the Pittsburgh Metropolitan Statistical Area in 2003. The county seat is New Castle....
, it also enters the borough of New Beaver
New Beaver, Pennsylvania
New Beaver is a borough in Lawrence County, Pennsylvania, United States. The population was 1,677 at the 2000 census.-Geography:New Beaver is located at ....
. Route 18 then turns northwestward, and passes through the borough of Wampum
Wampum, Pennsylvania
Wampum is a borough in Lawrence County, Pennsylvania, United States. The population was 678 at the 2000 census.-Geography:Wampum is located at ....
2 miles (3.2 km) later, where it intersects with the western terminus of PA Route 288
Pennsylvania Route 288
Pennsylvania Route 288 or State Route 288 is an east–west route in western Pennsylvania, United States. The highway is 15.4 miles long from PA Route 18 in Wampum to the U.S...
. The route re-enters New Beaver, then turns northward before its second intersection with PA Route 168
Pennsylvania Route 168
Pennsylvania Route 168 is a highway in Western Pennsylvania that runs for from Pennsylvania Route 18 in Frankfort Springs to Pennsylvania Route 208 in Volant...
over 3.5 miles (5.6 km) later, near the village of Moravia. Route 18 enters the city of New Castle
New Castle, Pennsylvania
New Castle is a city in Lawrence County, Pennsylvania, United States, northwest of Pittsburgh and near the Pennsylvania-Ohio border just east of Youngstown, Ohio; in 1910, the total population was 36,280; in 1920, 44,938; and in 1940, 47,638. The population has fallen to 26,309 according to the...
nearly 4 miles (6.4 km) later as it crosses the Mahoning River
Mahoning River
The Mahoning River is a river located in eastern Ohio and western Pennsylvania. It joins the Shenango River to form the Beaver River and is part of the Ohio River watershed.- Physical properties :...
, and then meets PA Route 108
Pennsylvania Route 108
Pennsylvania Route 108 is a highway in Western Pennsylvania that runs for from the Ohio state line near SNPJ to Pennsylvania Route 8 in Adams Corner. PA 108 intersects US Route 422 in New Castle and US Route 19 near Harlansburg...
. The two join and turn east, then northeast through the village of Mahoningtown, situated between the Mahoning and Shenango
Shenango River
The Shenango River is a principal tributary of the Beaver River, approximately 100 mi long, in western Pennsylvania in the United States. It also briefly flows through small portions of northeastern Ohio...
rivers. The concurrency then passes under US 422 about 0.8 miles (1.3 km) later before turning eastward and crossing the Shenango River. The concurrency then intersects 1.3 miles (2.1 km) later with PA Route 168, and the three routes overlap for 0.9 miles (1.4 km), heading northward. Routes 108 and 168 then leave the concurrency, and Route 18 continues northward. The route is then joined with Business US 422 near downtown New Castle for nearly 0.5 mile (0.80467 km). Business US 422 then leaves westward and Route 18 continues northward out of the city. Route 18 passes through the village of Walmo, and then intersects 4 miles (6.4 km) north of New Castle with Mitchell Rd., which carries traffic to I-376
Interstate 376
Interstate 376 is a major auxiliary route of the Interstate Highway System in the U.S. state of Pennsylvania, located entirely within the Allegheny Plateau. It runs from I-80 near Sharon south and east to a junction with the Pennsylvania Turnpike in Monroeville, after having crossed the Turnpike...
parallel to and west of Route 18. Over 1.6 miles (2.6 km) later, the route intersects with the southern terminus of PA 158
Pennsylvania Route 158
Pennsylvania Route 158 is located in western Pennsylvania, running from PA Route 18 south of New Wilmington in Lawrence County, to Mercer in Mercer County.-Route description:...
south of the borough of New Wilmington
New Wilmington, Pennsylvania
New Wilmington is a borough in Lawrence County, Pennsylvania, United States, first platted in 1824 and established as a borough on April 9, 1873. The population was 2,452 at the 2000 census...
, and 2.3 miles (3.7 km) later with PA 208
Pennsylvania Route 208
Pennsylvania Route 208 is located in Western Pennsylvania; its western terminus just west of the village of New Bedford in Lawrence County at US 422 and the Ohio state line...
west of the borough just before exiting Lawrence County 0.5 mile (0.80467 km) north of the intersection.
Mercer County
Upon entering Mercer CountyMercer County, Pennsylvania
Mercer County is a county located in the U.S. state of Pennsylvania. As of 2010, the population was 116,638. Its county seat is Mercer; Sharon is its largest city....
, the route winds northwesterly a few miles before turning west, where it has its second interchange with I-376 4.5 miles (7.2 km) later. Route 18 then turns northwesterly again, intersecting with the northern terminus of PA Route 551
Pennsylvania Route 551
Pennsylvania Route 551 is an long state highway located in Beaver, Lawrence, and Mercer counties in Pennsylvania. The southern terminus is at PA 18 in Beaver Falls...
0.4 mile (0.643736 km) later, and enters the borough of West Middlesex
West Middlesex, Pennsylvania
West Middlesex is a borough in Mercer County, Pennsylvania, along the Shenango River. The population was 929 at the 2000 census. It is part of the Youngstown–Warren–Boardman, OH-PA Metropolitan Statistical Area.-Geography:...
a mile after that. Here, the route intersects with PA Route 318
Pennsylvania Route 318
Pennsylvania Route 318 is an long state highway located in Mercer county in Pennsylvania. The western terminus is at the Ohio state line near West Middlesex. The eastern terminus is at PA 158 in Mercer.-Route description:...
. Turning northward, the route then passes under I-80 and has an interchange with PA Route 760
Pennsylvania Route 760
Pennsylvania Route 760 is a state highway located in Mercer County, Pennsylvania. The route runs from an interchange with Interstate 80 and I-376 in Shenango Township to an intersection with U.S. Route 62 Business and PA 718 in Sharon...
immediately after (Route 18 traffic interchanges with I-80 via this PA Route 760 interchange). Route 18 then enters the city of Hermitage
Hermitage, Pennsylvania
Hermitage is a city in Mercer County, Pennsylvania, United States. The population was 16,157 at the 2000 census. It is part of the Youngstown–Warren–Boardman, OH-PA Metropolitan Statistical Area.-History:...
, intersects with the southern terminus of PA Route 518
Pennsylvania Route 518
Pennsylvania Route 518 is an long state highway located in Mercer county in Pennsylvania. The southern terminus is at PA 18 in Hermitage. The northern terminus is at PA 18 in Hermitage.-Route description:...
a mile north of PA Route 760 at the village of Bobby’s Corners, and continues about 2 miles (3.2 km) before intersecting with US 62
U.S. Route 62
U.S. Route 62 runs from the US-Mexico border at El Paso, Texas to Niagara Falls, New York, near the United States-Canada border. It is the only east-west US Route that connects Mexico and Canada.Parts of U.S...
and then Business US 62 less than 0.3 mile (0.482802 km) later. Over 1.5 miles (2.4 km) after that, the route intersects with the northern terminus of PA Route 518 at the village of Lamont’s Corners east of the borough of Sharpsville
Sharpsville, Pennsylvania
Sharpsville is a borough in Mercer County, Pennsylvania, along the Shenango River. The population was 4,500 at the 2000 census. It is part of the Youngstown–Warren–Boardman, OH-PA Metropolitan Statistical Area.-Geography:...
before leaving Hermitage. The route enters the borough of Clark
Clark, Pennsylvania
Clark is a borough in Mercer County, Pennsylvania, United States. The population was 633 at the 2000 census. It is part of the Youngstown–Warren–Boardman, OH-PA Metropolitan Statistical Area.-Geography:...
about 2.2 miles (3.5 km) later, where it intersects with the northern terminus of PA Route 258
Pennsylvania Route 258
Pennsylvania Route 258 is an long state highway located in Butler and Mercer counties in Pennsylvania. The southern terminus is at PA 108/PA 173 in Slippery Rock. The northern terminus is at PA 18 in Clark.-Butler County:...
. Route 18 then crosses the Shenango River
Shenango River
The Shenango River is a principal tributary of the Beaver River, approximately 100 mi long, in western Pennsylvania in the United States. It also briefly flows through small portions of northeastern Ohio...
Reservoir, then passes near the villages of Transfer, Reynolds Heights, and Shenango before entering the borough of Greenville
Greenville, Pennsylvania
Greenville is a borough in Mercer County, Pennsylvania. Located along the Shenango River, Greenville is roughly 80 miles from both Pittsburgh and Cleveland. Greenville is part of the Youngstown–Warren–Boardman, OH-PA Metropolitan Statistical Area, which is home to 570,000 people...
8 miles (12.9 km) north of Clark. In Greenville, Route 18 intersects with the northern terminus of PA Route 846
Pennsylvania Route 846
Pennsylvania Route 846 is a long state highway located in Mercer county in Pennsylvania. The southern terminus is at PA 718 in Hermitage. The northern terminus is at PA 18 in Greenville.-Route description:...
just before its junction with PA Route 358
Pennsylvania Route 358
Pennsylvania Route 358 is located in Western Pennsylvania, running from the Ohio state line west of Greenville to Sandy Lake in Mercer County.-Route description:...
. Here, the two routes overlap, heading eastward, and cross the Shenango River
Shenango River
The Shenango River is a principal tributary of the Beaver River, approximately 100 mi long, in western Pennsylvania in the United States. It also briefly flows through small portions of northeastern Ohio...
once again, before intersecting about 0.5 mile (0.80467 km) later with PA Route 58
Pennsylvania Route 58
Pennsylvania Route 58 is located in Western Pennsylvania, running 71.2 miles from the Ohio state line west of Jamestown in Mercer County to Sligo in Clarion County.-Mercer County:...
, which joins the concurrency for about a quarter mile. Routes 18 and 58 then leave Route 358 and head northward. Less than a half mile later, Route 18 leaves the concurrency, turning northeastward, then northward, leaving Greenville. The Route continues through rural northern Mercer County about 4.5 miles (7.2 km) before passing through the village of Osgood, and leaves Mercer County less than a mile later.
Crawford County
After entering Crawford CountyCrawford County, Pennsylvania
Crawford County is a county located in the U.S. state of Pennsylvania. As of 2010, the population was 88,765.Crawford County was created on March 12, 1800, from part of Allegheny County and named for Colonel William Crawford...
, Route 18 then passes through the village of Adamsville about 2 miles (3.2 km) north of the county line, and, over 2.5 miles (4 km) later, enters the village of Hartstown, where it joins US 322
U.S. Route 322
U.S. Route 322 is a long, east–west United States Highway, traversing Ohio, Pennsylvania, and New Jersey. The road is a spur of U.S. Route 22 and one of the original highways from 1926...
, heading east-northeast. They travel over 5 miles (8 km) to the borough of Conneaut Lake
Conneaut Lake, Pennsylvania
Conneaut Lake is a borough in Crawford County, Pennsylvania at the southern end of a lake with the same name. The population was 708 at the 2000 census.-History:...
, where they serve Conneaut Lake Park
Conneaut Lake Park
Conneaut Lake Park is a summer amusement resort, located in Conneaut Lake, Pennsylvania, USA. It has long served as a regional tourist destination, and is loved by roller coaster enthusiasts for its classic Blue Streak coaster, which was recently classified as "historic" by the group American...
and join with US 6
U.S. Route 6
U.S. Route 6 , also called the Grand Army of the Republic Highway, a name that honors an American Civil War veterans association, is a main route of the U.S. Highway system, running east-northeast from Bishop, California to Provincetown, Massachusetts. Until 1964, it continued south from Bishop to...
/PA Route 285
Pennsylvania Route 285
Pennsylvania Route 285 is an 27 mile long, east–west state highway located in Crawford county in Pennsylvania, United States. The western terminus is the Ohio state line on Lake Pymatuning. The eastern terminus is at PA 173 in Cochranton.-Route description:PA 285 goes by many names...
, heading east. Route 285 leaves the concurrency one block later, and the remaining routes continue eastward out of the borough, nearly a mile later, where Route 18 then leaves the concurrency and heads northward. About 3.5 miles (5.6 km) north of the borough, Route 18 intersects with the northern terminus of PA Route 618
Pennsylvania Route 618
Pennsylvania Route 618 is an 3 mile long state highway located in Crawford county in Pennsylvania. The southern terminus is at US 6 in Sadsbury Township. The northern terminus is at PA 18 in Summit Township.-Route description:...
near Conneaut Lake Park
Conneaut Lake Park
Conneaut Lake Park is a summer amusement resort, located in Conneaut Lake, Pennsylvania, USA. It has long served as a regional tourist destination, and is loved by roller coaster enthusiasts for its classic Blue Streak coaster, which was recently classified as "historic" by the group American...
, and then passes through the village of Harmonsburg. About 7.5 miles (12.1 km) later, the route is joined by PA Route 198
Pennsylvania Route 198
Pennsylvania Route 198 is a long state highway located in Crawford County in Pennsylvania. The western terminus is at the Ohio state line near Pierpont, OH where it continues as Ohio SR 167. The eastern terminus is at PA 27 near Mount Hope....
, and the concurrency enters the borough of Conneautville
Conneautville, Pennsylvania
Conneautville is a borough in Crawford County, Pennsylvania, along Conneaut Creek. The population was 848 at the 2000 census.- History:Conneautville was founded in 1814 by Alexander Power, a surveyor and engineer. Conneautville was first called Powerstown or made reference to as Power’s Tract...
. In the borough, Route 198 leaves the concurrency nearly 0.9 miles (1.4 km) later, and Route 18 continues northward, passing through the borough of Springboro
Springboro, Pennsylvania
Springboro is a borough in Crawford County, Pennsylvania, United States. The population was 491 at the 2000 census.-History:Incorporated as a borough in the Spring of 1866, the crossroads officially became Springboro in 1875....
just over 3 miles (4.8 km) north of Conneautville.
Erie County
Over 3.5 miles (5.6 km) north of Springboro, the route crosses into Erie CountyErie County, Pennsylvania
Erie County is a county located in the U.S. state of Pennsylvania. As of 2010, the population was 280,566. Its county seat is the City of Erie.- Geography :...
, and enters the borough of Albion
Albion, Pennsylvania
Albion is a borough in Erie County, Pennsylvania, United States. The population was 1,607 at the 2000 census. A neighboring, larger town which many Albionites may associate with is Edinboro, and the much larger but more distant city of Erie. It is part of the Erie Metropolitan Statistical Area. One...
nearly 3 miles (4.8 km) later. Here, Route 18 joins US 6N eastward about 1.5 miles (2.4 km), leaving the borough, where Route 18 turns northward. A mile later, the route passes through the borough of Cranesville
Cranesville, Pennsylvania
Cranesville is a borough in Erie County, Pennsylvania, United States. The population was 600 at the 2000 census. It is part of the Erie Metropolitan Statistical Area.-Geography:Cranesville is located at ....
, and then enters the borough of Platea
Platea, Pennsylvania
Platea is a borough in Erie County, Pennsylvania, United States. The population was 474 at the 2000 census.-Geography:Platea is located at ....
about 3 miles (4.8 km) later, where it interchanges with I-90. Just over 2 miles (3.2 km) northward, Route 18 joins US 20 eastward into the borough of Girard
Girard, Pennsylvania
Girard is a borough in Erie County, Pennsylvania, United States. The population was 3,164 at the 2000 census. It is part of the Erie Metropolitan Statistical Area.-Geography:Girard is located at ....
for 1 miles (1.6 km), before leaving the concurrency and turning northward. Upon exiting Girard, the route enters the borough of Lake City
Lake City, Pennsylvania
Lake City is a borough in Erie County, Pennsylvania, United States. The population was 2,811 at the 2000 census. It is part of the Erie Metropolitan Statistical Area.-Geography:Lake City is located at ....
, where it terminates at PA Route 5
Pennsylvania Route 5
Pennsylvania Route 5 is a westward continuation of New York State Route 5 in Pennsylvania. It runs from North East, Pennsylvania at the New York-Pennsylvania border to near Erie, a total of . The highway is called the Purple Heart Highway and mostly called Lake Road...
near the shore of Lake Erie
Lake Erie
Lake Erie is the fourth largest lake of the five Great Lakes in North America, and the tenth largest globally. It is the southernmost, shallowest, and smallest by volume of the Great Lakes and therefore also has the shortest average water residence time. It is bounded on the north by the...
.
History
- 1927 The route was signed from Beaver FallsBeaver Falls, PennsylvaniaBeaver Falls is a city in Beaver County, Pennsylvania, United States. The population was 8,987 at the 2010 census. It is located 31 miles northwest of Pittsburgh, and on the Beaver River, six miles from its confluence with the Ohio River...
to ErieErie, PennsylvaniaErie is a city located in northwestern Pennsylvania in the United States. Named for the lake and the Native American tribe that resided along its southern shore, Erie is the state's fourth-largest city , with a population of 102,000... - 1928 Extended south from Beaver Falls to the West VirginiaWest VirginiaWest Virginia is a state in the Appalachian and Southeastern regions of the United States, bordered by Virginia to the southeast, Kentucky to the southwest, Ohio to the northwest, Pennsylvania to the northeast and Maryland to the east...
state line; also moved to its current alignment between PA 158Pennsylvania Route 158Pennsylvania Route 158 is located in western Pennsylvania, running from PA Route 18 south of New Wilmington in Lawrence County, to Mercer in Mercer County.-Route description:...
and GreenvilleGreenville, PennsylvaniaGreenville is a borough in Mercer County, Pennsylvania. Located along the Shenango River, Greenville is roughly 80 miles from both Pittsburgh and Cleveland. Greenville is part of the Youngstown–Warren–Boardman, OH-PA Metropolitan Statistical Area, which is home to 570,000 people...
from its previous alignment on current-day PA 158 near New WilmingtonNew Wilmington, PennsylvaniaNew Wilmington is a borough in Lawrence County, Pennsylvania, United States, first platted in 1824 and established as a borough on April 9, 1873. The population was 2,452 at the 2000 census...
to MercerMercer, PennsylvaniaMercer is a borough in Mercer County, Pennsylvania, United States. The population was 2,391 at the 2000 census. It is the county seat of Mercer County. Mercer is part of the Youngstown–Warren–Boardman, OH-PA Metropolitan Statistical Area....
and PA 58Pennsylvania Route 58Pennsylvania Route 58 is located in Western Pennsylvania, running 71.2 miles from the Ohio state line west of Jamestown in Mercer County to Sligo in Clarion County.-Mercer County:...
from Mercer to Greenville. - 1963 Moved from Liberty St., Atlantic Ave., and Washington St. in New CastleNew Castle, PennsylvaniaNew Castle is a city in Lawrence County, Pennsylvania, United States, northwest of Pittsburgh and near the Pennsylvania-Ohio border just east of Youngstown, Ohio; in 1910, the total population was 36,280; in 1920, 44,938; and in 1940, 47,638. The population has fallen to 26,309 according to the...
to its current alignment on Mahoning Ave. and Jefferson St. - 1970 Widened from PA 518 in HermitageHermitage, PennsylvaniaHermitage is a city in Mercer County, Pennsylvania, United States. The population was 16,157 at the 2000 census. It is part of the Youngstown–Warren–Boardman, OH-PA Metropolitan Statistical Area.-History:...
(north end near SharpsvilleSharpsville, PennsylvaniaSharpsville is a borough in Mercer County, Pennsylvania, along the Shenango River. The population was 4,500 at the 2000 census. It is part of the Youngstown–Warren–Boardman, OH-PA Metropolitan Statistical Area.-Geography:...
) to ClarkClark, PennsylvaniaClark is a borough in Mercer County, Pennsylvania, United States. The population was 633 at the 2000 census. It is part of the Youngstown–Warren–Boardman, OH-PA Metropolitan Statistical Area.-Geography:...
, and median installed; also, designation moved to the Beaver Valley Expressway (now Interstate 376 and PA 760Pennsylvania Route 760Pennsylvania Route 760 is a state highway located in Mercer County, Pennsylvania. The route runs from an interchange with Interstate 80 and I-376 in Shenango Township to an intersection with U.S. Route 62 Business and PA 718 in Sharon...
) expressway between the West MiddlesexWest Middlesex, PennsylvaniaWest Middlesex is a borough in Mercer County, Pennsylvania, along the Shenango River. The population was 929 at the 2000 census. It is part of the Youngstown–Warren–Boardman, OH-PA Metropolitan Statistical Area.-Geography:...
interchange and the end of the Beaver Valley Expressway - 1971 Widened and median installed from US 62 north to Highland Rd. in Hermitage (then Hickory Township)
- 1972 Widening completed from Clark to Shenango (village, near Greenville)
- 1978 Designation moved back to current alignment from the Beaver Valley Expressway designation of 1970; Business PA 18 designation through West Middlesex was eliminated
- 1997 Widened to 5 lanes from the north Beaver Valley Expressway interchange near West Middlesex to US 62 in Hermitage
- 2002 Widening completed from US 62 in Hermitage to PA 518 near Sharpsville
- 2008 Rerouted away from Geneva College in Beaver Falls to make the campus more safe for students.
Major intersections
Spur routes
- PA 218Pennsylvania Route 218Pennsylvania Route 218 is an long state highway located in Greene county in Pennsylvania. The southern terminus is at the West Virginia state line at Blacksville, WV. The northern terminus is at US 19/PA 21 in Waynesburg.-Route description:...
from the West VirginiaWest VirginiaWest Virginia is a state in the Appalachian and Southeastern regions of the United States, bordered by Virginia to the southeast, Kentucky to the southwest, Ohio to the northwest, Pennsylvania to the northeast and Maryland to the east...
state line in Greene CountyGreene County, Pennsylvania-Demographics:As of the census of 2000, there were 40,672 people, 15,060 households, and 10,587 families residing in the county. The population density was 71 people per square mile . There were 16,678 housing units at an average density of 29 per square mile...
to WaynesburgWaynesburg, PennsylvaniaWaynesburg is a borough in and the county seat of Greene County, Pennsylvania, United States, southwest of Pittsburgh. The population was 4,184 at the 2000 census....
(does not intersect with parent route) - PA 318Pennsylvania Route 318Pennsylvania Route 318 is an long state highway located in Mercer county in Pennsylvania. The western terminus is at the Ohio state line near West Middlesex. The eastern terminus is at PA 158 in Mercer.-Route description:...
from the OhioOhioOhio is a Midwestern state in the United States. The 34th largest state by area in the U.S.,it is the 7th‑most populous with over 11.5 million residents, containing several major American cities and seven metropolitan areas with populations of 500,000 or more.The state's capital is Columbus...
state line west of West MiddlesexWest Middlesex, PennsylvaniaWest Middlesex is a borough in Mercer County, Pennsylvania, along the Shenango River. The population was 929 at the 2000 census. It is part of the Youngstown–Warren–Boardman, OH-PA Metropolitan Statistical Area.-Geography:...
to MercerMercer, PennsylvaniaMercer is a borough in Mercer County, Pennsylvania, United States. The population was 2,391 at the 2000 census. It is the county seat of Mercer County. Mercer is part of the Youngstown–Warren–Boardman, OH-PA Metropolitan Statistical Area.... - PA 418Pennsylvania Route 418Pennsylvania Route 418 is an long state highway located in Mercer county in Pennsylvania. The southern terminus is at PA 760/PA 718 in Wheatland. The northern terminus is at US 62 in Hermitage.-Route description:...
from WheatlandWheatland, PennsylvaniaWheatland is a borough in Mercer County, Pennsylvania, along the Shenango River. The population was 748 at the 2000 census. It is part of the Youngstown–Warren–Boardman, OH-PA Metropolitan Statistical Area....
to HermitageHermitage, PennsylvaniaHermitage is a city in Mercer County, Pennsylvania, United States. The population was 16,157 at the 2000 census. It is part of the Youngstown–Warren–Boardman, OH-PA Metropolitan Statistical Area.-History:...
(does not intersect with parent route) - PA 518Pennsylvania Route 518Pennsylvania Route 518 is an long state highway located in Mercer county in Pennsylvania. The southern terminus is at PA 18 in Hermitage. The northern terminus is at PA 18 in Hermitage.-Route description:...
in Hermitage - PA 618Pennsylvania Route 618Pennsylvania Route 618 is an 3 mile long state highway located in Crawford county in Pennsylvania. The southern terminus is at US 6 in Sadsbury Township. The northern terminus is at PA 18 in Summit Township.-Route description:...
near Conneaut LakeConneaut Lake, PennsylvaniaConneaut Lake is a borough in Crawford County, Pennsylvania at the southern end of a lake with the same name. The population was 708 at the 2000 census.-History:... - PA 718Pennsylvania Route 718Pennsylvania Route 718 is an long state highway located in Mercer county in Pennsylvania. The southern terminus is at PA 318 in Shenango Township. The northern terminus is the Ohio state line in South Pymatuning Township.-Route description:...
from west of West Middlesex to the Ohio state line north of SharonSharon, PennsylvaniaSharon is a city in Mercer County, Pennsylvania, in the United States, northwest of Pittsburgh. It is part of the Youngstown–Warren–Boardman, OH-PA Metropolitan Statistical Area.- History :...
(does not intersect with parent route)