Alaskan Way Viaduct
E514992
The Alaskan Way Viaduct was an elevated highway along Seattle’s waterfront that carried a section of State Route 99 before being demolished due to seismic vulnerability and replaced by a tunnel.
All labels observed (8)
How this entity was disambiguated
This entity first appeared as the object of triple T5377787 — 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: Alaskan Way Viaduct Context triple: [Alaskan Way, formerlyServedBy, Alaskan Way Viaduct]
-
A.
Spokane Street Viaduct
The Spokane Street Viaduct is an elevated roadway in Seattle that connects Interstate 5 to the West Seattle Bridge, carrying traffic over the SoDo industrial district.
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B.
Sixth Street Viaduct
The Sixth Street Viaduct is an iconic Los Angeles bridge known for spanning the downtown area and connecting the Arts District with Boyle Heights.
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C.
Park Avenue Viaduct
The Park Avenue Viaduct is an elevated roadway in Midtown Manhattan that carries traffic around Grand Central Terminal, connecting Park Avenue across 42nd Street.
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D.
SR 520 Bridge
The SR 520 Bridge is a major floating bridge across Lake Washington in Seattle, Washington, known as one of the longest floating bridges in the world and a key link between Seattle and its eastern suburbs.
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E.
Riverside Drive Viaduct
Riverside Drive Viaduct is an elevated steel and concrete roadway structure in Manhattan that carries Riverside Drive above the Amtrak rail lines and low-lying areas along the Hudson River.
- 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: Alaskan Way Viaduct Target entity description: The Alaskan Way Viaduct was an elevated highway along Seattle’s waterfront that carried a section of State Route 99 before being demolished due to seismic vulnerability and replaced by a tunnel.
-
A.
Spokane Street Viaduct
The Spokane Street Viaduct is an elevated roadway in Seattle that connects Interstate 5 to the West Seattle Bridge, carrying traffic over the SoDo industrial district.
-
B.
Sixth Street Viaduct
The Sixth Street Viaduct is an iconic Los Angeles bridge known for spanning the downtown area and connecting the Arts District with Boyle Heights.
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C.
Park Avenue Viaduct
The Park Avenue Viaduct is an elevated roadway in Midtown Manhattan that carries traffic around Grand Central Terminal, connecting Park Avenue across 42nd Street.
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D.
SR 520 Bridge
The SR 520 Bridge is a major floating bridge across Lake Washington in Seattle, Washington, known as one of the longest floating bridges in the world and a key link between Seattle and its eastern suburbs.
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E.
Riverside Drive Viaduct
Riverside Drive Viaduct is an elevated steel and concrete roadway structure in Manhattan that carries Riverside Drive above the Amtrak rail lines and low-lying areas along the Hudson River.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
elevated highway
ⓘ
former transportation infrastructure ⓘ |
| adjacentTo |
Elliott Bay
NERFINISHED
ⓘ
Seattle waterfront NERFINISHED ⓘ |
| carried |
motor vehicle traffic
ⓘ
north–south traffic through downtown Seattle ⓘ |
| closedToTraffic | 2019 ⓘ |
| connectedTo |
Battery Street Tunnel (former)
NERFINISHED
ⓘ
Spokane Street Viaduct NERFINISHED ⓘ |
| constructionStart | 1950 ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| crosses | rail yards along Seattle waterfront ⓘ |
| demolitionEnd | 2019 ⓘ |
| demolitionStart | 2019 ⓘ |
| environmentalImpact | obstructed views of Elliott Bay ⓘ |
| length |
approximately 2.0 miles
ⓘ
approximately 3.2 kilometers ⓘ |
| locatedIn |
Seattle
NERFINISHED
ⓘ
Seattle waterfront NERFINISHED ⓘ Washington ⓘ
surface form:
Washington (state)
|
| lowerDeckDirection | southbound ⓘ |
| maintainedBy | Washington State Department of Transportation NERFINISHED ⓘ |
| namedAfter | Alaskan Way NERFINISHED ⓘ |
| notableFor |
controversy over replacement options
ⓘ
major component of Seattle’s waterfront freeway system ⓘ |
| opened | 1953 ⓘ |
| ownedBy | State of Washington NERFINISHED ⓘ |
| parallelTo | Elliott Bay shoreline NERFINISHED ⓘ |
| partOf |
State Route 99
NERFINISHED
ⓘ
U.S. Highway system (state route component) NERFINISHED ⓘ |
| passesNear |
Belltown
NERFINISHED
ⓘ
Pioneer Square NERFINISHED ⓘ |
| passesThrough | Downtown Seattle NERFINISHED ⓘ |
| projectName | Alaskan Way Viaduct Replacement Program NERFINISHED ⓘ |
| reasonForDemolition |
earthquake safety concerns
ⓘ
seismic vulnerability ⓘ |
| replacedBy |
Alaskan Way Viaduct replacement tunnel
NERFINISHED
ⓘ
State Route 99 tunnel NERFINISHED ⓘ |
| roadCarried | Washington State Route 99 NERFINISHED ⓘ |
| significantEvent | damaged in 2001 Nisqually earthquake ⓘ |
| status | demolished ⓘ |
| structureType | double-deck elevated freeway ⓘ |
| tunnelLocation | beneath downtown Seattle ⓘ |
| tunnelType | bored road tunnel ⓘ |
| upperDeckDirection | northbound ⓘ |
| urbanImpact | separated downtown Seattle from its waterfront ⓘ |
| vulnerableTo | major earthquakes ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Alaskan Way Viaduct Description of subject: The Alaskan Way Viaduct was an elevated highway along Seattle’s waterfront that carried a section of State Route 99 before being demolished due to seismic vulnerability and replaced by a tunnel.
Referenced by (9)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Alaskan Way Viaduct (former elevated highway)
this entity surface form:
SR 99 Tunnel in Seattle
this entity surface form:
Alaskan Way Viaduct (former)
this entity surface form:
Alaskan Way Viaduct with State Route 99 Tunnel
this entity surface form:
Alaskan Way Viaduct replacement and waterfront redevelopment program
this entity surface form:
Alaskan Way Viaduct replacement corridor
this entity surface form:
Alaskan Way Viaduct replacement tunnel (SR 99 tunnel)