Washington State Route 518

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State Route 518 Auxiliary route of I-5
Defined by RCW 47.17.715, maintained by WSDOT
Length:	3.42 mi[1] (5.50 km)
Formed:	1964
West end:	SR 509 in Burien
Major junctions:	SR 99 in Seatac
East end:	I-5/I-405 in Tukwila
State highways in Washington < SR 516 SR 519 > Lists: current - 1937-70 - 1964 renumbering

State Route 518 is a state highway in the U.S. state of Washington. It extends just under 3.5 miles (5.6 km) from Burien in the west to Tukwila in the east.

Contents 1 Route description 2 Exit list 3 References 4 External links

[edit] Route description

Originating at State Route 509, SR 518 runs east past Seattle-Tacoma International Airport, just east of which is an interchange with State Route 99 (International Boulevard). It intersects with Interstate 5 just northwest of Westfield Southcenter and continues eastward as Interstate 405. It is a freeway its entire length.

A significant portion of Route 518's traffic is between the airport and the interstate.

The interchange between the SR 509 and SR 518 freeways currently is not a freeway to freeway junction. Traffic often backs up on the existing ramp from southbound SR 509 to get to SR 518. WSDOT has planned a project to improve the interchange by adding a flyover ramp to connect southbound SR 509 traffic to SR 518.

[edit] Exit list

The entire route is in King County.

Location	Mile[1]	Destinations	Notes
Burien	0.00	Southwest 148th Street, 1st Avenue South – Burien	At-grade intersection
	0.00	SR 509 – Des Moines, Seattle
	0.60	Des Moines Memorial Drive	Westbound exit and eastbound entrance
Seatac
	1.62	To SR 99 / South 154th Street	Eastbound exit and westbound entrance
	1.87	Sea-Tac Airport
	2.10	SR 99	Westbound exit and eastbound entrance
Tukwila
	3.12	51st Avenue South, Southcenter Parkway	Eastbound exit and westbound entrance
	3.42	I-5 – Tacoma, Seattle	Eastbound exit and westbound entrance
	3.42	I-405 north – Renton, Bellevue	Eastbound exit and westbound entrance

[edit] References

[edit] External links

• Highways of Washington State

	v • d • e State highways 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 537 - SR 540