Pennsylvania Route 18

PA 18PA Route 1818Route 18Pennsylvania State Route 18Seventh Avenue
Pennsylvania Route 18 (PA 18) is a major north–south highway in Western Pennsylvania whose southern terminus is at West Virginia Route 69 at the state line in Greene County, Pennsylvania near the village of Garrison, while the northern terminus is at PA Route 5 in Lake City, Pennsylvania.wikipedia
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Pennsylvania Route 136

PA 136PA Route 136Route 136
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.
The western terminus is at US 40 & PA 18 in Washington.

Pennsylvania Route 231

PA 231PA Route 231Pa. 231
Route 18 enters Washington County, and intersects with the eastern terminus of PA Route 231 and turns to the northeast and traveling over 5 mi, passing near the villages of Old Concord and Sparta.
The southern terminus is at PA 18 near Old Concord.

Pennsylvania Route 168

PA 168PA Route 168
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.
Pennsylvania Route 168 (PA 168) is a highway in Western Pennsylvania that runs for 55 mi from Pennsylvania Route 18 in Frankfort Springs to Pennsylvania Route 208 in Volant.

U.S. Route 40 in Pennsylvania

US 40U.S. Route 40Pennsylvania Route 11 (1920s)
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.
Route 40 leaves Chestnut St. and joins PA 18 becoming Jefferson Ave.

Pennsylvania Route 844

PA 844PA Route 844Pa. 844
Before departing the city, 0.4 mi later, the route intersects with the eastern terminus of PA Route 844, turns northward, and passes through the village of Oak Grove.
The eastern terminus is at PA 18 in Washington.

Pennsylvania Route 21

PA 2121PA Route 21
Traveling northward from West Virginia Route 69 at the West Virginia 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 mi from the state line.
Just before reaching Rogersville, Route 21 merges with Pennsylvania Route 18 near West Greene High School.

Lake City, Pennsylvania

Lake City
Pennsylvania Route 18 (PA 18) is a major north–south highway in Western Pennsylvania whose southern terminus is at West Virginia Route 69 at the state line in Greene County, Pennsylvania near the village of Garrison, while the northern terminus is at PA Route 5 in Lake City, Pennsylvania.
Lake City is served by two Pennsylvania state routes: Pennsylvania Route 5 running east/west as West Lake Road, and Pennsylvania Route 18 running north/south as Lake Street and Rice Avenue.

Pennsylvania Route 65

PA 65PA Route 6565
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.
PA 65 is similar in its purpose to PA 18 and PA 51, both of which run parallel to PA 65 at one point or another; however, the three routes pass through different cities for most of their respective alignments.

Pennsylvania Route 551

PA 551551PA Route 551
Route 18 briefly joins with PA Route 588, and then intersects with the southern terminus of PA Route 551 2 mi later, just before leaving the city and entering the borough of Big Beaver.
The southern terminus is at PA 18 in Beaver Falls.

Pennsylvania Route 50

PA 50PA Route 50Pa. 50
Route 18 passes through the village of Gretna 8.5 mi later and then overlaps with PA Route 50 for 0.5 mi a couple miles west of the village of Hickory before continuing north-northwest.
The route runs through more agricultural and wooded areas with some residences, coming to an intersection with PA 18.

New Brighton, Pennsylvania

New BrightonNew Brighton, PANew Brighton, Pa.
The concurrency enters the borough of New Brighton, where Route 18 then leaves the concurrency over 2 mi later, crosses the Beaver River, enters the city of Beaver Falls, and continues northward almost 2 mi.
Pennsylvania Routes 18 and 65 run through the center of the borough as Third Avenue.

Pennsylvania Turnpike

I-276Interstate 276PA Turnpike
The route then passes through the borough of Homewood about 1.5 mi later, and re-enters Big Beaver, where it interchanges with I-76 and The Pennsylvania Turnpike.
After this interchange, the turnpike reaches the exit for PA 18 in Homewood before crossing the Beaver River on the Beaver River Bridge.

Monaca, Pennsylvania

MonacaPhillipsburgLöwenburg
As Route 18 approaches the Ohio River, it turns east-northeast before its first interchange with I-376 about 2 mi west of the borough of Monaca.
There is a historical marker, located near the point where Fourth Street meets Route 18, which reads: "Water Cure Sanatorium founded 1848 by Dr. Edward Acker. Used hydropathy or water to heal. First hospital in Beaver County. Town's first post office, 1856. Phillipsburg Soldiers Orphans School founded 1866 by Rev. William Taylor. Destroyed by fire 1876. Beaver County Historical Research & Landmarks Foundation".

Pennsylvania Route 288

PA 288288PA 238
Route 18 then turns northwestward, and passes through the borough of Wampum 2 mi later, where it intersects with the western terminus of PA Route 288.
The highway is 15.4 miles (24 km) long and runs from PA 18 in Wampum to the US 19/PA 68 concurrency in Zelienople.

Pennsylvania Route 221

PA 221PA Route 221State Route 221
Next, the route meets PA Route 221, and the two overlap for just over a mile, heading northwest through the village of Prosperity.
The route winds northwest through areas of farms and woods with some homes, coming to an intersection with PA 18.

Homewood, Pennsylvania

Homewood
The route then passes through the borough of Homewood about 1.5 mi later, and re-enters Big Beaver, where it interchanges with I-76 and The Pennsylvania Turnpike.
The Pennsylvania Turnpike (Interstate 76) passes through the northeast corner of the borough, with Exit 13 (Pennsylvania Route 18/Big Beaver Boulevard) located just outside the borough limits.

Pennsylvania Route 68

PA 68PA Route 68Pennsylvania S.R. 68
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.
Here, PA 68 splits from PA 51 and heads onto two-lane undivided Adams Street, coming to a traffic circle with PA 18, which heads south and cross the Ohio River on the Rochester–Monaca Bridge.

Koppel, Pennsylvania

Koppel
Route 18 then passes through the borough of Koppel nearly 1.5 mi later, where it intersects with PA Route 351, and then re-enters Big Beaver a third time before leaving Beaver County 1.3 mi later.
Pennsylvania Route 18 (Big Beaver Boulevard) follows the western border of the borough, leading south 6 mi to Beaver Falls and north 14 mi to New Castle.

Pennsylvania Route 158

PA 158
Over 1.6 mi later, the route intersects with the southern terminus of PA 158 south of the borough of New Wilmington, and 2.3 mi later with PA 208 west of the borough just before exiting Lawrence County 0.5 mi north of the intersection.
Pennsylvania Route 158 (PA 158) is an 11.9 mi state highway located in western Pennsylvania, running from PA 18 south of New Wilmington in Lawrence County, to US 62 and PA 258 in Mercer in Mercer County.

Pennsylvania Route 588

PA 588PA Route 588588
Route 18 briefly joins with PA Route 588, and then intersects with the southern terminus of PA Route 551 2 mi later, just before leaving the city and entering the borough of Big Beaver.
PA 588 intersects PA 18 and turns north to form a concurrency with that route on 7th Avenue, a two-lane divided highway that passes homes.

West Virginia Route 69

West Virginia Route 70 (1920s)WV Route 69 North
Traveling northward from West Virginia Route 69 at the West Virginia 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 mi from the state line. Pennsylvania Route 18 (PA 18) is a major north–south highway in Western Pennsylvania whose southern terminus is at West Virginia Route 69 at the state line in Greene County, Pennsylvania near the village of Garrison, while the northern terminus is at PA Route 5 in Lake City, Pennsylvania.
The northern terminus is at the Pennsylvania state line three miles (5 km) north of Hundred, where WV 69 continues northward as Pennsylvania Route 18.

Beaver River (Pennsylvania)

Beaver RiverBeaverBeaver Valley
The concurrency enters the borough of New Brighton, where Route 18 then leaves the concurrency over 2 mi later, crosses the Beaver River, enters the city of Beaver Falls, and continues northward almost 2 mi.
The river is roughly parallel to the border with the state of Ohio, with both Interstate 376 and Pennsylvania Route 18 running parallel to the river itself.

Pennsylvania Route 151

PA Route 151
The route then junctions with PA Route 151 at the village of Mechanicsburg about 1.5 mi later, and then passes through the village of McCleary.
The road heads through forested areas with some farms and homes, crossing into Raccoon Township and intersecting PA 18.

Pennsylvania Route 208

PA 208PA Route 208PA 278
Over 1.6 mi later, the route intersects with the southern terminus of PA 158 south of the borough of New Wilmington, and 2.3 mi later with PA 208 west of the borough just before exiting Lawrence County 0.5 mi north of the intersection.
The road continues another 3.6 mi east, where it junctions with PA 18 about 1.4 mi west of the borough of New Wilmington, which the route enters shortly thereafter.

New Castle, Pennsylvania

New CastleNew Castle, PALawrence County Composite
Route 18 enters the city of New Castle nearly 4 mi later as it crosses the Mahoning River, and then meets PA Route 108.
Among local routes, Interstate 376, Pennsylvania Route 18, and U.S. Route 422 are the major routes running through the city, while two more major routes — Pennsylvania Route 65 and U.S. Route 224 — both terminate in the city.