Pennsylvania Route 551
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| Maintained by PennDOT | ||||
| Length: | 33.6 mi (54.1 km) | |||
| Major junctions | ||||
| South end: |
 PA 18 in Beaver Falls
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    I-376 in Big Beaver PA 168 in Darlington PA 351 in Enon Valley PA 108 in North Beaver Township PA 317 in North Beaver Township US 224 in Mahoning Township US 422 in Mahoning Township PA 208 in Pulaski Township
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| North end: |
PA 18 near West Middlesex
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| Location | ||||
| Counties: | Beaver, Lawrence, Mercer | |||
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| Location: | Enon Valley–Mount Jackson |
| Length: | 3.0 mi (4.8 km) |
| Existed: | 1940–1964 |
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Pennsylvania Route 551 (PA 551) is a 34-mile-long (55 km) state highway located in Beaver, Lawrence, and Mercer Counties in Pennsylvania. The southern terminus is at PA 18 in Beaver Falls. The northern terminus is at PA 18 near West Middlesex.
Though officially a spur route of Pennsylvania Route 51, PA 551 is more suited as a spur route of PA 18, due to PA 551 ending at PA 18 at both ends without intersecting with PA 51 at all. (PA 51 and PA 551 come within a mile of each other near Darlington, Pennsylvania at their closest point.) While PA 18 passes through larger cities, PA 551 goes through more rural areas.
PA 551 begins at an intersection with PA 18 in Beaver Falls, Beaver County, heading west on two-lane undivided 49th Street Extended. The road passes between commercial areas to the north and homes to the south, crossing under Norfolk Southern's Fort Wayne Line and heading into West Mayfield, becoming Wallace Run Road. The route heads into wooded areas with some homes, crossing Wallace Run into Big Beaver. PA 551 continues northwest along the northern bank of Wallace Run, coming to an interchange with I-376 that has a toll plaza on the ramps to and from the northbound direction of I-376. The road heads into a mix of farmland and woodland with some residences, curving more to the west. The route heads southwest and crosses into Chippewa Township, turning northwest and briefly passing through Big Beaver again prior to entering Darlington Township. PA 551 curves west and heads into South Beaver Township, where it turns north onto Old Darlington Road and comes to an intersection with PA 168. Here, PA 168 turns north to form a concurrency with the route, crossing the North Fork Little Beaver Creek into Darlington Township. The road heads into Darlington and becomes Market Street as it heads through residential areas, with PA 168 splitting to the east in a commercial area. PA 551 continues north past more homes, turning east onto 5th Street as it forms the border between Darlington to the south and Darlington Township to the north. The route turns north onto Hollow Road and fully enters Darlington Township, heading into a mix of farms and woods with some residences. The road curves to the northwest as it heads through more rural areas.
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Wikipedia