Title: Washington State Route 509 - Wikipedia
Headings: Washington State Route 509
Washington State Route 509
Contents
Route description
History
Major intersections
References
External links

Content: Washington State Route 509 - Wikipedia
Washington State Route 509
From Wikipedia, the free encyclopedia
Jump to navigation Jump to search
State Route 509
SR 509 highlighted in red
Route information
Auxiliary route of I-5
Defined by RCW 47.17.680
Maintained by WSDOT
Length
35.17 mi (56.60 km)
Existed
1964 –present
Major junctions
South end
I-705 in Tacoma

SR 99 in Federal Way
SR 516 in Des Moines
SR 518 in Burien
North end
SR 99 in Seattle
Location
Counties
Pierce, King

Highway system
State highways in Washington
Interstate
US
State
Scenic
Former PSH
1964 renumbering
Former
← SR 508

→ SR 510
State Route 509 ( SR 509) is a 35.17-mile-long (56.60 km) state highway in the U.S. state of Washington, connecting Tacoma in Pierce County to Seattle in King County. The highway travels north from Interstate 705 (I-705) in Tacoma to SR 99 south of downtown Seattle. It serves cities along the Puget Sound and west of Seattle–Tacoma International Airport in south King County, including Federal Way, Des Moines, and Burien. SR 509 is part of the National Highway System and is a limited-access highway near the Port of Tacoma and from Burien to its northern terminus in Seattle. Prior to the 1964 highway renumbering, the highway was part of Secondary State Highway 1V (SSH 1V) from Tacoma to Des Moines and SSH 1K from Des Moines to Seattle. SR 509 was re-aligned onto the Burien Freeway in 1968 and the Port of Tacoma bypass in 1997, coinciding with the opening of its interchange with I-705 and the cable-stayed 21st Street Bridge. Various proposals since 1988 have recommended building a freeway extension of SR 509 within the city of SeaTac, connecting the Burien Freeway to I-5, that remains unbuilt but is currently funded and will be extended to I-5 by 2028. Contents
1 Route description
2 History
3 Major intersections
4 References
5 External links
Route description
SR 509 traveling across the Thea Foss Waterway on the cable-stayed 21st Street Bridge within Tacoma, connecting downtown to the Port of Tacoma. SR 509 begins as South 21st Street at a single-point urban interchange with I-705 in downtown Tacoma in Pierce County, providing access to the Tacoma campus of the University of Washington and the Tacoma Link light rail line on Pacific Avenue. The highway travels east over the Thea Foss Waterway on the cable-stayed 21st Street Bridge into the Port of Tacoma as a four-lane limited-access highway, intersecting Portland Avenue in a half- diamond interchange before crossing the Puyallup River.