Washington State Route 171
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| Broadway Avenue | ||||
SR 171 is highlighted in red.
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| Route information | ||||
| Auxiliary route of SR 17 | ||||
| Defined by RCW 47.17.350 | ||||
| Maintained by WSDOT | ||||
| Length | 3.79 mi (6.10 km) | |||
| Existed | 1964 – present | |||
| Major junctions | ||||
| South end |
 I-90 in Moses Lake
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 I‑90 Bus. in Moses Lake |
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| North end |
 SR 17 in Moses Lake |
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| Location | ||||
| Counties | Grant | |||
| Highway system | ||||
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State Route 171 (SR 171, named Broadway Avenue) is a 3.79-mile (6.10 km) long state highway serving the city of Moses Lake in Grant County, located in the U.S. state of Washington. Broadway Avenue begins at an interchange with Interstate 90 (I-90) and travels northeast through Downtown Moses Lake concurrent to Interstate 90 Business and parallel to Parker Horn before ending at an intersection with SR 17. Broadway Avenue was previously part of Primary State Highway 18 (PSH 18) and U.S. Route 10 (US 10) until the 1964 highway renumbering. The highway also has an un-built extension from Moses Lake northeast to Odessa that was first legislated in 1955 as Secondary State Highway 7E (SSH 7E).
State Route 171 (SR 171) and Interstate 90 Business (I-90 Business) begin their 2.99-mile (4.81 km) long concurrency as Broadway Avenue at a diamond interchange with Interstate 90 (I-90) in Moses Lake. The street travels north over a branch of the Columbia Basin Railroad into Downtown Moses Lake and turns northeast to parallel the Parker Horn before the split between SR 171 and I-90 Business, which becomes Pioneer Way. The highway continues northeast to leave Downtown Moses Lake and end at an intersection with SR 17, which bypasses the city.
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