State Route 99 Tunnel
E664515
The State Route 99 Tunnel is a major underground highway tunnel in Seattle that replaced the Alaskan Way Viaduct to carry traffic along the State Route 99 corridor.
All labels observed (3)
| Label | Occurrences |
|---|---|
| State Route 99 Tunnel canonical | 4 |
| State Route 99 Tunnel under downtown Seattle | 1 |
| State Route 99 tunnel | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T7438168 — 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: State Route 99 Tunnel Context triple: [Washington State Route 99, hasStructure, State Route 99 Tunnel]
-
A.
Tehachapi Crossing tunnels
The Tehachapi Crossing tunnels are a series of large water conveyance tunnels that carry California Aqueduct flows beneath the Tehachapi Mountains as part of the State Water Project.
-
B.
Sumner Tunnel
The Sumner Tunnel is a major vehicular tunnel in Boston that carries traffic under Boston Harbor between East Boston and downtown.
-
C.
O'Neill Tunnel
The O'Neill Tunnel is a major highway tunnel in downtown Boston that carries Interstate 93 beneath the city as part of the Big Dig project.
-
D.
San Bernardino Tunnel
The San Bernardino Tunnel is a major road tunnel in the Swiss Alps that provides a key north–south transit route between German-speaking and Italian-speaking Switzerland.
-
E.
Anton Anderson Memorial Tunnel
The Anton Anderson Memorial Tunnel is a combined rail and highway tunnel in Alaska that provides the only road access to the town of Whittier through the Chugach Mountains.
- 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: State Route 99 Tunnel Target entity description: The State Route 99 Tunnel is a major underground highway tunnel in Seattle that replaced the Alaskan Way Viaduct to carry traffic along the State Route 99 corridor.
-
A.
Tehachapi Crossing tunnels
The Tehachapi Crossing tunnels are a series of large water conveyance tunnels that carry California Aqueduct flows beneath the Tehachapi Mountains as part of the State Water Project.
-
B.
Sumner Tunnel
The Sumner Tunnel is a major vehicular tunnel in Boston that carries traffic under Boston Harbor between East Boston and downtown.
-
C.
O'Neill Tunnel
The O'Neill Tunnel is a major highway tunnel in downtown Boston that carries Interstate 93 beneath the city as part of the Big Dig project.
-
D.
San Bernardino Tunnel
The San Bernardino Tunnel is a major road tunnel in the Swiss Alps that provides a key north–south transit route between German-speaking and Italian-speaking Switzerland.
-
E.
Anton Anderson Memorial Tunnel
The Anton Anderson Memorial Tunnel is a combined rail and highway tunnel in Alaska that provides the only road access to the town of Whittier through the Chugach Mountains.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
road tunnel
ⓘ
transport infrastructure ⓘ |
| adjacentTo | Elliott Bay ⓘ |
| breakthroughDate | 2017 ⓘ |
| builtWith | Bertha tunnel boring machine ⓘ |
| connects |
Downtown Seattle
ⓘ
linked to:
downtown Seattle
SODO ⓘ
linked to:
Seattle industrial district (SoDo)
South Lake Union ⓘ
linked to:
South Lake Union neighborhood
|
| constructionCost | over 3 billion US dollars ⓘ |
| constructionStartDate | 2013 ⓘ |
| country |
United States
ⓘ
linked to:
United States of America
|
| endPoint | South Lake Union area of Seattle ⓘ |
| hasEmergencyExits | yes ⓘ |
| hasFireSuppressionSystem | yes ⓘ |
| hasLanes |
2 lanes northbound
ⓘ
2 lanes southbound ⓘ |
| hasSpeedLimit | generally 45 miles per hour ⓘ |
| hasTrafficControlSystem | yes ⓘ |
| hasVentilationSystem | yes ⓘ |
| isTollRoad | yes ⓘ |
| length |
approximately 2 miles
ⓘ
approximately 3.2 kilometers ⓘ |
| locatedIn |
King County, Washington
ⓘ
linked to:
King County
Seattle, Washington ⓘ
linked to:
Seattle, Washington, United States
Washington (state) ⓘ
linked to:
Washington
|
| maintainedBy | Washington State Department of Transportation ⓘ |
| numberOfDecks | 2 ⓘ |
| numberOfTubes | 1 ⓘ |
| openedToTollingDate | 2019-11-09 ⓘ |
| openingDate | 2019-02-04 ⓘ |
| operator | Washington State Department of Transportation ⓘ |
| owner | Washington State Department of Transportation ⓘ |
| partOf |
Seattle waterfront replacement program
ⓘ
linked to:
Seattle waterfront piers
State Route 99 ⓘ |
| primaryFunction | carry State Route 99 traffic under downtown Seattle ⓘ |
| replacedStructureType | elevated freeway viaduct ⓘ |
| replaces | Alaskan Way Viaduct ⓘ |
| roadType | limited-access highway ⓘ |
| routeNumber | 99 ⓘ |
| startPoint |
SODO neighborhood of Seattle
ⓘ
linked to:
SoDo neighborhood of Seattle
|
| tollingMethod |
Good To Go! transponder system
ⓘ
all-electronic tolling ⓘ |
| trafficDirection |
lower deck southbound
ⓘ
upper deck northbound ⓘ |
| tunnelType | bored tunnel ⓘ |
| under |
Belltown
ⓘ
Downtown Seattle ⓘ
linked to:
downtown Seattle
South Lake Union vicinity ⓘ |
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: State Route 99 Tunnel Description of subject: The State Route 99 Tunnel is a major underground highway tunnel in Seattle that replaced the Alaskan Way Viaduct to carry traffic along the State Route 99 corridor.
Referenced by (6)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: State Route 99 Tunnel
linked to: State Route 99 Tunnel