Washington State Route 509

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State Route 509
Number based on I-5
RCW 47.17.680
Formed: 1964
South end: I-705 in Tacoma
Major
junctions:
SR 99 in Federal Way
SR 516 in Des Moines
SR 518 in SeaTac
North end: SR 99 in Seattle
Washington State Routes
SR-509 cable stay bridge in Tacoma, Washington
SR-509 cable stay bridge in Tacoma, Washington

State Route 509 is a state highway in the U.S. state of Washington. It extends just over 35 miles (56.6 km) from Tacoma in the south to Seattle in the north.

Originating at Interstate 705 in Tacoma, it travels over a suspension bridge as a four-lane limited access highway east towards Fife before turning northward, skirting the Tacoma tideflats and rounding Brown's Point to Dash Point State Park. Entering King County it winds on top of the bluff along the south shore of Poverty Bay through Federal Way until connecting with State Route 99. It then follows SR 99 and State Route 516 into Des Moines and Normandy Park. It continues north as a four-lane freeway, skirting the western edge of the Seattle-Tacoma International Airport and intersecting State Route 518 in Burien. The route descends to the Duwamish River and terminates in the Industrial District south of downtown Seattle, where it rejoins State Route 99.

A proposal to link SR-509 directly to I-5 south of Sea-Tac Airport is expected to relieve congestion by attracting much truck traffic to the more direct route.

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State routes in Washington related to I-5
SR 500 - SR 501 - SR 502 - SR 503 (Spur) - SR 504 (Spur) - SR 505 - SR 506 - SR 507 - SR 508 - SR 509 - SR 510 - SR 512 - SR 513 - SR 515 - SR 516 - SR 518 - SR 519 - SR 520 - SR 522 - SR 523 - SR 524 (Spur: Edmonds, Lynnwood) - SR 525 (Spur) - SR 526 - SR 527 - SR 528 - SR 529 (Spur) - SR 530 - SR 531 - SR 532 - SR 534 - SR 536 - SR 538 - SR 539 - SR 542 - SR 543 - SR 544 - SR 546 - SR 547 - SR 548 - SR 599
Former or proposed state routes: SR 514 - SR 517 - SR 537 - SR 540
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