| State Route 518 | ||||
|---|---|---|---|---|
| Route information | ||||
| Auxiliary route of I-5 | ||||
| Defined by RCW 47.17.715 | ||||
| Maintained by WSDOT | ||||
| Length: | 3.42 mi[1] (5.50 km) | |||
| Existed: | 1964 – present | |||
| Major junctions | ||||
| West end: | SR 509 in Burien | |||
| SR 99 in Seatac | ||||
| East end: | I-5/I-405 in Tukwila | |||
| Highway system | ||||
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State highways in Washington
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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.
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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.
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 |
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