Washington State Route 530
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| Pioneer Highway | ||||
SR 530 is highlighted in red.
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| Route information | ||||
| Auxiliary route of I‑5 | ||||
| Defined by RCW 47.17.755 | ||||
| Maintained by WSDOT | ||||
| Length: | 50.52 mi (81.30 km) | |||
| Existed: | 1964 – present | |||
| Major junctions | ||||
| West end: |
 I‑5 near Arlington
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 SR 9 in Arlington |
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| East end: |
 SR 20 in Rockport
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| Highway system | ||||
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State Route 530 (SR 530) is a Washington state highway in Snohomish and Skagit counties. The 50.52-mile (81.30 km) long route runs northeast from an interchange with Interstate 5 (I-5) southwest of Arlington past SR 9 in Arlington and Darrington to end at SR 20 in Rockport. Serving the communities of Arlington, Arlington Heights, Oso, Darrington and Rockport, the roadway travels parallel to a fork of the Stillaguamish River from Arlington to Darrington, the Sauk River from Darrington to Rockport and a BNSF Railway route that extends from Arlington to Cicero, located west of Oso.
The first segment of SR 530 to appear on a map was a road extending from Arlington to Oso in 1899. The first segment to be state-maintained was Secondary State Highway 1E (SSH 1E), which ran from Conway to Arlington. SSH 1E was extended to Darrington in 1957 and later renumbered to SR 530 in 1964; the road was extended to Rockport in 1983 and later the route from Conway to I-5 was removed from the system in 1991. Since 1991, minor construction projects arranged by the Washington State Department of Transportation (WSDOT) have improved the roadway and WSDOT plans to realign the highway near the Sauk River.
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