State Route 518

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Washington State Route 518 Map
Washington State Route 518 East
Washington 518 begins at the South 148th Street parclo interchange with the Washington 509 freeway near downtown Burien. Washington 509 joins Burien with Des Moines and Normandy Park to the south and Seattle to the north. Photo taken 08/30/06.
A loop ramp shuttles drivers onto Washington 509 north to Boulevard Park and the Duwamish industrial area of Seattle. Washington 518 commences on its own freeway east to Seattle-Tacoma International Airport and Interstates 5 & 405 at Tukwila. Photo taken 08/30/06.
Leaving Washington 509, motorists see the first eastbound shield of Washington 518 and quickly enter the city of SeaTac. Photo taken 08/29/06.
One half mile west of the South 154th Street half diamond interchange on Washington 518 east. 154th Street, the original alignment of Washington 518, provides access to Pacific Highway / Tukwila International Boulevard (former Washington 99) at Riverton Heights. Photo taken 08/29/06.
A second runway lighting trestle passes high above Washington 518 near the half diamond interchange with Des Moines Way. Photo taken 08/29/06.
South 154th Street straddles the northern perimeter of Seattle-Tacoma International Airport between Five Corners in Burien and 24th Avenue South at Washington 518. A directional interchange with North Entry and North Exit Drive, the freeway between the Airport Terminal and Washington 518, follows. Photo taken 08/29/06.
North Entry Drive heads south to the Seattle-Tacoma International Airport with an off-ramp to South 170th Street between Washington 518 and the terminal. The entire freeway was redesigned to accommodate an elevated transit line. Photo taken 08/29/06.
Washington 518 enters the city of Tukwila. and lowers to meet 51st Avenue South and Interstates 5 and 405. Photo taken 08/29/06.
A half diamond interchange joins Washington 518 with 51st Avenue South ahead Interstate 5. 51st Avenue South transitions to Klickitat Drive en route to Southcenter Parkway at Southcenter Mall, east of Interstate 5. Photo taken 08/29/06.
Washington 518 becomes Interstate 405 north within the directional cloverleaf interchange of Interstate 5. A left side ramp connects eastbound with Interstate 5 north to Seattle. Photo taken 08/29/06.
The southbound ramp to Interstate 5 departs almost immediately after wards for Kent, Federal Way, and Tacoma. Photo taken 08/29/06.
Washington State Route 518 West
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Interstate 405 south becomes Washington 518 west at the directional cloverleaf interchange with Interstate 5. A loop ramp carries drivers onto Interstate 5 south for Federal Way, Tacoma, and Portland. Photos taken 08/29/06.
Washington 518 ascends from Tukwila to SeaTac and Seattle-Tacoma International Airport. A distributor roadway leaves in one half mile for Pacific Highway / Tukwila International Boulevard (former Washington 99) and North Entry Drive to the airport. Photo taken 08/30/06.
Washington 518 provides the main access point to Seattle-Tacoma International Airport from Interstate 5 and the Seattle freeway network. Two lanes depart the westbound freeway for North Entry Drive, a short freeway leading to South 170th Street and the terminal. Photo taken 08/30/06.
A separate ramp departs the Airport exit first for South 154th Street and Pacific Highway. Pacific Highway was a part of Washington 99 until 2004. South 154th Street represents the original alignment of Washington 518. Photo taken 08/29/06.
Westbound at the ramp split for Pacific Highway, South 154th Street, and North Entry Drive south. Photo taken 08/30/06.
Continuing west, Washington 518 approaches the Des Moines Memorial Drive half diamond interchange and two runway lighting trestles. Photo taken 08/30/06.
Des Moines Memorial Drive winds north from Washington 518 to Boulevard Park and south to Five Points in the city of Burien. Photo taken 08/30/06.
The Washington 518 freeway ends in one half mile at South 148th Street near the Burien city center. Photo taken 08/30/06.
Departing the freeway next is the northbound ramp to the Washington 509 freeway. Washington 509 ventures north from Burien to the Duwamish industrial area of Seattle. Photo taken 08/30/06.
A parclo interchange facilitates the movements between the Washington 518 and 509 freeways. Traffic signals lie at both ends of the interchange. Photo taken 08/30/06.
Washington 518 ends at Washington 509, a north-south freeway from Des Moines to Washington 99 (West Marginal Way) near South Park in Seattle. Washington 509 and 99 provide a direct route to the Seattle City Center from here. Photo taken 08/30/06.
Heading south, Washington 509 skirts the west side of Seattle-Tacoma International Airport to Des Moines Memorial Drive and South 188th Street. A planned extension of the freeway will realign the route on a southeasterly course to Interstate 5 and Washington 516 in Kent. Photo taken 08/30/06.
South 148th Street stems west from Washington 509 and 518 to the commercialized intersection with 1st Avenue South. 1st Avenue South is old Washington 509. Photo taken 08/30/06.
1st Avenue South travels north-south to Beverly Park and Sunnydale from near the Burien city center. 148th Street continues west to 16th Avenue SW near the Seahurst neighborhood of the city. Photo taken 08/30/06.

Photo Credits:

08/29/06, 08/30/06 by AARoads

Connect with:
Interstate 5
Interstate 405
State Route 509

Page Updated 10-26-2010.