Oregon State Route 43
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| Route information | ||||
| Maintained by ODOT | ||||
| Length: | 11.60 mi (18.67 km) | |||
| Existed: | 1939 – present | |||
| Major junctions | ||||
| South end: |
 OR 99E in Oregon City
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 I-205 in West Linn
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| North end: |
  I-5 / US 26 in Portland
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Oregon Route 43 is an Oregon state highway that runs between the cities of Oregon City and Portland, mostly along the western flank of the Willamette River. While it is technically known by the Oregon Department of Transportation as the Oswego Highway No. 3 (see Oregon highways and routes), on maps it is referred to by its route number or by the various street names it has been given.
The southern terminus of Oregon Route 43 is at a junction with Oregon Route 99E in downtown Oregon City. From there, it runs east for two blocks, along the couplet of Main and Railroad streets, and then turns north and crosses the Willamette River on the historic Oregon City Bridge, entering the city of West Linn. Almost immediately on the West Linn side of the river is an interchange with Interstate 205. It continues north through West Linn (where it is called Willamette Drive), providing service to numerous neighborhoods and business districts. Due to constrained geography (the city is mostly located on the sides of a steep slope) and encroaching homes and businesses, the route is only a two-lane road in many stretches.
North of West Linn, the highway passes by Marylhurst University, and enters the city of Lake Oswego. In the southern portions of Lake Oswego, Route 43 is given the street name of Pacific Highway, a designation that usually refers to Oregon Route 99 (the highway is a historic routing of U.S. Route 99). Soon after, the route crosses over Oswego Creek and enters downtown Lake Oswego, where it is known as South State Street (between McVey Avenue and A Avenue) and North State Street (between A Avenue and Terwilliger Boulevard). The Willamette Shore Trolley begins just south of A Avenue across from the Millennium Plaza Park on South State Street, and parallels Oregon Route 43 as both head north into Portland.
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