{{Short description|State highway in King County, Washington, US}} {{Use American English|date=May 2025}} {{Use mdy dates|date=December 2015}} {{Infobox road |state=WA |type=SR |route=599 |spur_type=I |spur_of=5 |section=808 |map=Washington State Route 599 Map.svg |map_notes=Map of King County in western Washington with SR 599 highlighted in red |length_mi=1.75 |length_round=2 |length_ref=<ref name="log">{{WSDOT State Highway Log |year=2017 |pages=1662–1663 |link=yes |accessdate=December 23, 2018}}</ref> |established=1971 |direction_a=South |terminus_a={{jct|state=WA|I|5}} in Tukwila |direction_b=North |terminus_b={{jct|state=WA|SR|99}} in Tukwila |county=King |previous_type=SR |previous_route=548 |next_type=SR |next_route=702 }}
'''State Route 599''' ('''SR 599''') is a state highway and freeway in King County, Washington, United States. It is located entirely within the city of Tukwila and travels {{convert|1.75|mi|km|2}} northwest along the Duwamish River between junctions with Interstate 5 (I-5) and SR 99. The freeway has one intermediate exit and follows the Link light rail 1 Line.
==Route description== thumb|Traffic on SR 599 after dark SR 599 is {{convert|1.75|mi|km|2}} long and travels on a four-lane freeway located entirely within the city of Tukwila in suburban King County.<ref name="log"/> It begins at a Y interchange with I-5 near Foster Memorial Park, approximately {{convert|1.4|mi|km|1}} north of the Southcenter Mall and the terminus of Interstate 405. The interchange lacks connections to the north side of I-5, which are provided by the parallel Interurban Avenue, and has a direct offramp to the high-occupancy vehicle lanes on southbound I-5.<ref>{{cite web |date=February 28, 2017 |title=SR 5 – Exit 156: Junction SR 599/Interurban Avenue |url=http://www.wsdot.wa.gov/mapsdata/tools/InterchangeViewer/pdf/SR005/005X156.pdf |publisher=Washington State Department of Transportation |access-date=December 23, 2018}}</ref> The only intermediate junction on SR 599 is a partial cloverleaf interchange at South 133rd Street near several office parks, including the headquarters of BECU.<ref name="google">{{google maps |title=State Route 599 |url=https://www.google.com/maps/dir/47.4828005,-122.2713875/47.4982494,-122.2948193/@47.4903761,-122.2918874,15z/am=t/data=!3m1!4b1!4m2!4m1!3e0 |access-date=December 23, 2018}}</ref><ref name="Junction">{{cite web |date=June 15, 2015 |title=SR 599: Junction Interurban Avenue/S 133rd Street |url=http://www.wsdot.wa.gov/mapsdata/tools/InterchangeViewer/pdf/SR599/599X000.pdf |publisher=Washington State Department of Transportation |access-date=December 23, 2018}}</ref>
The freeway then travels northwest, following the elevated Central Link light rail tracks to the west and the Duwamish River and the Green River Trail to the east.<ref>{{cite map |title=Link light rail |url=http://www.soundtransit.org/schedules/light-rail/link-light-rail/map |publisher=Sound Transit |cartography=Bing Maps |access-date=August 22, 2016}}</ref> SR 599 then turns west to travel around a King County Metro bus base, which has a direct onramp to the southbound freeway,<ref name="Junction"/> and crosses under the light rail tracks at East Marginal Way South. The freeway turns west and intersects Tukwila International Boulevard, which marks the end of SR 599 and where SR 99 resumes.<ref>{{cite web |date=January 21, 2010 |title=SR 99: Junction SR 599/Tukwila International Boulevard |url=http://www.wsdot.wa.gov/mapsdata/tools/InterchangeViewer/pdf/SR099/099X022.pdf |publisher=Washington State Department of Transportation |access-date=December 23, 2018}}</ref> SR 99 continues northwest along the freeway and into Seattle on West Marginal Way.<ref name="google"/>
SR 599 is maintained by the Washington State Department of Transportation (WSDOT) and is designated as a minor route of the National Highway System.<ref>{{cite web |title=2017 State Highway National Highway System Routes in Washington |url=https://www.wsdot.wa.gov/mapsdata/travel/hpms/pdf/washington-2017-state-highway-nhs-list.pdf |publisher=Washington State Department of Transportation |access-date=December 23, 2018}}</ref> WSDOT conducts an annual survey of average traffic volume on the state highway system that is measured in terms of annual average daily traffic, finding in 2016 that approximately 44,000 vehicles use SR 599.<ref>{{cite report |year=2017 |title=2016 Annual Traffic Report |page=213 |url=https://www.wsdot.wa.gov/mapsdata/travel/pdf/Annual_Traffic_Report_2016.pdf |publisher=Washington State Department of Transportation |url-status=dead |archive-url=https://web.archive.org/web/20200208001700/https://www.wsdot.wa.gov/mapsdata/travel/pdf/Annual_Traffic_Report_2016.pdf |archive-date=February 8, 2020 |access-date=December 23, 2018}}</ref>
==History== SR 599 became a state highway in 1971,<ref name="rcw">{{cite web |url=http://apps.leg.wa.gov/RCW/default.aspx?cite=47.17.808 |title=RCW 47.17.808: State Route 599 |author=Washington State Legislature |author-link=Washington State Legislature |access-date=September 28, 2008}}</ref> but had been part of Washington's older highway system (Primary and Secondary Highways) from 1957 to 1970.<ref name="1957-law">{{cite book |author-link=Washington State Legislature |author=Washington State Legislature |title=Session Laws of the State of Washington |url=https://books.google.com/books?id=Zck4AAAAIAAJ |access-date=August 10, 2008 |edition=1957 |year=1957 |publisher=Washington State Legislature |location=Olympia, Washington |chapter=Chapter 172}}</ref> The highway, then known as PSH 1 WM, or West Marginal Branch,<ref name="1957-law"/> was built during the 1960s. When it was completed and opened to traffic in June 1968,<ref>{{Cite web|url=https://cdm16977.contentdm.oclc.org/digital/collection/p16977coll3/id/369/rec/13|title = SR 99 I-5 to Pacific Highway South Opening June 25, 1968 4}}</ref> U.S. Route 99 (US 99) was about to be removed from the system, so when I-5 was completed up to Tukwila, US 99 switched to the route of SR 599. Later on, the current route of SR 599 became known as US 99T (Temporary) and later SR 99T in 1964. In 1971, the highway became SR 599.<ref name="rcw"/> SR 181 was temporarily routed alongside the freeway on Interurban Avenue until 1971.<ref>{{Cite web|url=https://www.flickr.com/photos/tigerzombie/5069068935/sizes/o/|title = All sizes | Seattle Street Map 1966 Chevron | Flickr - Photo Sharing!}}</ref>
==Exit list== {{jcttop|state=WA|county=King|location=Tukwila|length_ref=<ref name="log"/>}} {{WAint |mile=0.00 |type=incomplete |road={{jct|state=WA|I|5|to2=to|I|405|location1=Portland}} |notes=Southbound exit and northbound entrance }} {{WAint |mile=0.36 |road=South 133rd Street / Interurban Avenue – Tukwila |notes= }} {{WAint |mile=0.83 |type=incomplete |road=King County Metro South Base |notes=Southbound entrance only }} {{WAint |mile=1.75 |road={{jct|state=WA|SR|99|dir1=north|road|Tukwila International Boulevard|city1=Seattle}} |notes=Continues north as SR 99 }} {{jctbtm|keys=incomplete}}
==References== {{Reflist|33em}}
==External links== {{Attached KML}} {{commons category}} *[https://www.angelfire.com/wa2/hwysofwastate/sr599.html Highways of Washington State] *[http://www.wsdot.wa.gov/Traffic/seattle/direction/I5_SR599_interchange.htm Traffic camera for SR 599 {{spaced ndash}} I-5 Interchange (WSDOT)]
{{State highways in Washington related to I-5}}
599 Category:U.S. Route 99 Category:Freeways in the United States Category:Transportation in King County, Washington