San Francisco–Oakland Bay Bridge
E32851
The San Francisco–Oakland Bay Bridge is a major multi-span suspension and cantilever bridge connecting San Francisco and Oakland, serving as one of the primary highway links across the central part of the San Francisco Bay.
All labels observed (11)
How this entity was disambiguated
This entity first appeared as the object of triple T70611 — 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: San Francisco–Oakland Bay Bridge Context triple: [San Francisco Bay, crossedBy, San Francisco–Oakland Bay Bridge]
-
A.
Golden Gate Bridge
The Golden Gate Bridge is an iconic red-orange suspension bridge spanning the Golden Gate Strait, renowned as a symbol of San Francisco and a landmark of American engineering.
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B.
Key Bridge
Key Bridge is a historic steel-arch bridge spanning the Potomac River, connecting Washington, D.C. to Arlington, Virginia.
-
C.
Theodore Roosevelt Bridge
The Theodore Roosevelt Bridge is a major highway bridge over the Potomac River in Washington, D.C., carrying traffic between the city and Arlington, Virginia.
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D.
Mystic River Bridge
The Mystic River Bridge, officially known as the Maurice J. Tobin Memorial Bridge, is a major steel cantilever roadway bridge in Boston, Massachusetts, carrying U.S. Route 1 over the Mystic River between Charlestown and Chelsea.
-
E.
St. Johns Bridge
St. Johns Bridge is a historic steel suspension bridge in Portland, Oregon, noted for its striking Gothic-style towers and scenic span over the Willamette 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: San Francisco–Oakland Bay Bridge Target entity description: The San Francisco–Oakland Bay Bridge is a major multi-span suspension and cantilever bridge connecting San Francisco and Oakland, serving as one of the primary highway links across the central part of the San Francisco Bay.
-
A.
Golden Gate Bridge
The Golden Gate Bridge is an iconic red-orange suspension bridge spanning the Golden Gate Strait, renowned as a symbol of San Francisco and a landmark of American engineering.
-
B.
Key Bridge
Key Bridge is a historic steel-arch bridge spanning the Potomac River, connecting Washington, D.C. to Arlington, Virginia.
-
C.
Theodore Roosevelt Bridge
The Theodore Roosevelt Bridge is a major highway bridge over the Potomac River in Washington, D.C., carrying traffic between the city and Arlington, Virginia.
-
D.
Mystic River Bridge
The Mystic River Bridge, officially known as the Maurice J. Tobin Memorial Bridge, is a major steel cantilever roadway bridge in Boston, Massachusetts, carrying U.S. Route 1 over the Mystic River between Charlestown and Chelsea.
-
E.
St. Johns Bridge
St. Johns Bridge is a historic steel suspension bridge in Portland, Oregon, noted for its striking Gothic-style towers and scenic span over the Willamette River.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
bridge
ⓘ
cantilever bridge ⓘ road bridge ⓘ suspension bridge ⓘ toll bridge ⓘ |
| alsoKnownAs |
Bay Bridge
ⓘ
San Francisco–Oakland Bay Bridge ⓘ |
| carries |
Interstate highway traffic
ⓘ
vehicular traffic ⓘ |
| connects |
Oakland
ⓘ
San Francisco ⓘ |
| constructionStartDate | 1933 ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| crosses | San Francisco Bay ⓘ |
| designer |
Charles H. Purcell
ⓘ
Daniel E. Moran ⓘ Leon Moisseiff ⓘ
surface form:
Leon S. Moisseiff
Ralph Modjeski ⓘ |
| easternSpanType | self-anchored suspension bridge ⓘ |
| hasPart |
Yerba Buena Tunnel
ⓘ
surface form:
Yerba Buena Island tunnel
eastern span ⓘ western span ⓘ |
| hasTollPlaza | Oakland side ⓘ |
| length |
about 4.46 miles
ⓘ
about 7.18 km ⓘ |
| locatedIn |
California, United States
ⓘ
surface form:
California
|
| locatedInCity |
Oakland
ⓘ
San Francisco ⓘ |
| locatedInMetropolitanArea | San Francisco Bay Area ⓘ |
| maintainedBy |
Bay Area Toll Authority
ⓘ
Caltrans ⓘ
surface form:
California Department of Transportation
|
| newEasternSpanOpened | 2013 ⓘ |
| opened | 1936-11-12 ⓘ |
| openedBy |
President Franklin D. Roosevelt
ⓘ
surface form:
President Franklin D. Roosevelt (via telephone ceremony)
|
| openedToTraffic | 1936 ⓘ |
| originalEasternSpanClosed | 2013 ⓘ |
| parallelTo |
Transbay Tube
ⓘ
surface form:
San Francisco–Oakland Transbay Tube
|
| partOf | Interstate 80 ⓘ |
| partOfNetwork |
Bay Area toll bridge network
ⓘ
surface form:
Bay Area toll bridge system
|
| passesThrough | Yerba Buena Island ⓘ |
| regionServed | Northern California ⓘ |
| replacedStructure | original eastern cantilever span ⓘ |
| retrofitAfter | 1989 Loma Prieta earthquake ⓘ |
| significance | major highway link across central San Francisco Bay ⓘ |
| subjectOf | Loma Prieta earthquake retrofitting ⓘ |
| tollCollectionMethod | all-electronic tolling ⓘ |
| tollDirection | westbound ⓘ |
| trafficLanes | multiple lanes in each direction ⓘ |
| westernSpanType | suspension bridge ⓘ |
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: San Francisco–Oakland Bay Bridge Description of subject: The San Francisco–Oakland Bay Bridge is a major multi-span suspension and cantilever bridge connecting San Francisco and Oakland, serving as one of the primary highway links across the central part of the San Francisco Bay.
Referenced by (52)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Yerba Buena Island Tunnel
this entity surface form:
eastern span of the San Francisco–Oakland Bay Bridge
this entity surface form:
San Francisco–Oakland Bay Bridge eastern span replacement
this entity surface form:
eastern span of the San Francisco–Oakland Bay Bridge
this entity surface form:
San Francisco–Oakland Bay Bridge western span
this entity surface form:
San Francisco–Oakland Bay Bridge eastern span
this entity surface form:
San Francisco–Oakland Bay Bridge system
subject surface form:
Cupid's Span
this entity surface form:
San Francisco–Oakland Bay Bridge approaches
subject surface form:
Pier 1 (San Francisco)
this entity surface form:
San Francisco–Oakland Bay Bridge western approach
Treasure Island, San Francisco, California, United States
→
connectedBy
→
San Francisco–Oakland Bay Bridge
ⓘ
this entity surface form:
San Francisco–Oakland Bay Bridge (as an alternate crossing of the Bay)
this entity surface form:
San Francisco–Oakland Bay Bridge projects