Washington State Route 99

E171672

north–south highway road transportation infrastructure state highway

Washington State Route 99 is a major north–south highway in western Washington that runs through the Seattle metropolitan area, historically serving as the region’s primary arterial route before Interstate 5.

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All labels observed (7)

Label	Occurrences
Washington State Route 99 canonical	13
Pacific Highway South (State Route 99) in the Federal Way area	1
State Route 99 corridor in Seattle	1
State Route 99 in Federal Way	1
State Route 99 in Seattle area	1
U.S. Route 99 in Washington	1
Washington State Route 99 (on part of former alignment)	1

How this entity was disambiguated

This entity first appeared as the object of triple T1190938 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07

Target entity: Washington State Route 99
Context triple: [Federal Way, Washington, majorHighway, Washington State Route 99]

A. Washington State Route 18
Washington State Route 18 is a major east–west highway in western Washington that connects the Seattle–Tacoma metropolitan area to Interstate 90 near Snoqualmie.
B. Oregon Route 99W
Oregon Route 99W is a state highway in western Oregon that runs through the Willamette Valley, serving as a major north–south route parallel to Interstate 5.
C. Oregon Route 8
Oregon Route 8 is a state highway in northwestern Oregon that runs through the Tualatin Valley, connecting several suburban communities west of Portland.
D. Oregon Route 38
Oregon Route 38 is a state highway in Oregon that runs east–west between the coast and Interstate 5, following the Umpqua River and serving as a key route through Douglas County.
E. Oregon Route 126
Oregon Route 126 is a major east–west state highway in Oregon that connects the Eugene–Springfield area with coastal and central parts of the state.
F. None of above. chosen
G. Unsure - the case is ambiguous/there is not enough information to decide.

NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07

Target entity: Washington State Route 99
Target entity description: Washington State Route 99 is a major north–south highway in western Washington that runs through the Seattle metropolitan area, historically serving as the region’s primary arterial route before Interstate 5.

A. Washington State Route 18
Washington State Route 18 is a major east–west highway in western Washington that connects the Seattle–Tacoma metropolitan area to Interstate 90 near Snoqualmie.
B. Oregon Route 99W
Oregon Route 99W is a state highway in western Oregon that runs through the Willamette Valley, serving as a major north–south route parallel to Interstate 5.
C. Oregon Route 8
Oregon Route 8 is a state highway in northwestern Oregon that runs through the Tualatin Valley, connecting several suburban communities west of Portland.
D. Oregon Route 38
Oregon Route 38 is a state highway in Oregon that runs east–west between the coast and Interstate 5, following the Umpqua River and serving as a key route through Douglas County.
E. Oregon Route 126
Oregon Route 126 is a major east–west state highway in Oregon that connects the Eugene–Springfield area with coastal and central parts of the state.
F. None of above. chosen

Statements (48)

Predicate	Object
instanceOf	north–south highway ⓘ road transportation infrastructure ⓘ state highway ⓘ
abbreviation	SR 99 ⓘ WA 99 ⓘ
country	United States ⓘ linked to: United States of America
crosses	Duwamish Waterway ⓘ linked to: Duwamish River
formerDesignation	U.S. Route 99 ⓘ linked to: Federal Highway U.S. Route 99
formerFunction	primary highway connection between Seattle and Everett before Interstate 5 ⓘ primary highway connection between Seattle and Tacoma before Interstate 5 ⓘ
hasJunctionWith	Interstate 5 ⓘ State Route 104 ⓘ State Route 509 ⓘ State Route 518 ⓘ State Route 525 ⓘ
hasStructure	Alaskan Way Viaduct (former) ⓘ linked to: Alaskan Way Viaduct State Route 99 Tunnel ⓘ
historicalRole	primary north–south arterial route in the Seattle region before Interstate 5 ⓘ
locatedIn	Seattle metropolitan area ⓘ western Washington ⓘ
maintainedBy	Washington State Department of Transportation ⓘ
namedSegment	Aurora Avenue North in Seattle ⓘ linked to: Aurora Avenue North Evergreen Way in Everett ⓘ Pacific Highway South in south King County ⓘ
openedStructure	State Route 99 Tunnel in 2019 ⓘ
parallelTo	Interstate 5 ⓘ
partOf	Washington State Route system ⓘ linked to: Washington State Routes
passesNear	Seattle–Tacoma International Airport ⓘ
replacedStructure	Alaskan Way Viaduct with State Route 99 Tunnel ⓘ linked to: Alaskan Way Viaduct
roadType	limited-access highway in some segments ⓘ surface arterial in some segments ⓘ
runsThrough	Edmonds ⓘ linked to: Edmonds, Washington Everett ⓘ Federal Way ⓘ Fife ⓘ Kent ⓘ Lynnwood ⓘ SeaTac ⓘ Seattle ⓘ Shoreline ⓘ Tukwila ⓘ
serves	commuter traffic in the Seattle metropolitan area ⓘ freight traffic in the Seattle metropolitan area ⓘ
state	Washington ⓘ
transportationCorridorFor	King County ⓘ Pierce County ⓘ Snohomish County ⓘ
urban	true ⓘ

How these facts were elicited

Referenced by (19)

Full triples — surface form annotated when it differs from this entity's canonical label.

Federal Way, Washington → majorHighway → Washington State Route 99 ⓘ

subject linked to: Federal Way, Washington, United States

Washington State Routes → hasComponent → Washington State Route 99 ⓘ

Hazel Dell, Washington → hasMajorRoad → Washington State Route 99 ⓘ

Salmon Creek, Washington → hasMajorRoad → Washington State Route 99 ⓘ

State Route 509 → hasJunction → State Route 99 in Seattle area ⓘ