Longfellow Bridge
E35507
Longfellow Bridge is a historic steel and granite bridge in Boston, Massachusetts, known for carrying road and rail traffic between Boston and Cambridge across the Charles River.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Longfellow Bridge canonical | 13 |
| Longfellow Bridge, Boston–Cambridge | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T89931 — 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: Longfellow Bridge Context triple: [Charles River, hasBridge, Longfellow Bridge]
-
A.
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.
-
B.
Memorial Bridge
Memorial Bridge is a prominent ceremonial bridge spanning the Potomac River, symbolically linking Arlington National Cemetery with the Lincoln Memorial in Washington, D.C.
-
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.
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.
-
E.
Woodrow Wilson Bridge
The Woodrow Wilson Bridge is a major bascule highway bridge carrying the Capital Beltway (I-95/I-495) between Virginia and Maryland just south of Washington, D.C.
- 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: Longfellow Bridge Target entity description: Longfellow Bridge is a historic steel and granite bridge in Boston, Massachusetts, known for carrying road and rail traffic between Boston and Cambridge across the Charles River.
-
A.
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.
-
B.
Memorial Bridge
Memorial Bridge is a prominent ceremonial bridge spanning the Potomac River, symbolically linking Arlington National Cemetery with the Lincoln Memorial in Washington, D.C.
-
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.
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.
-
E.
Woodrow Wilson Bridge
The Woodrow Wilson Bridge is a major bascule highway bridge carrying the Capital Beltway (I-95/I-495) between Virginia and Maryland just south of Washington, D.C.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
bridge
ⓘ
granite bridge ⓘ historic place ⓘ road-rail bridge ⓘ steel bridge ⓘ |
| alsoKnownAs | Salt-and-Pepper Bridge ⓘ |
| carries |
MBTA Red Line
ⓘ
Massachusetts Route 28 ⓘ Massachusetts Route 3 ⓘ rail traffic ⓘ road traffic ⓘ |
| connects |
Boston, Massachusetts
ⓘ
surface form:
Boston
City of Cambridge ⓘ
surface form:
Cambridge
|
| constructionStartDate | 1900 ⓘ |
| crosses | Charles River ⓘ |
| crossesAt | between Beacon Hill and Kendall Square ⓘ |
| hasArchitecturalStyle | Beaux-Arts elements ⓘ |
| hasDesign |
arch bridge
ⓘ
viaduct ⓘ |
| hasFeature |
granite piers
ⓘ
ornamental towers ⓘ steel arches ⓘ |
| hasLength | about 1,767 feet ⓘ |
| hasNicknameOrigin | towers resemble salt and pepper shakers ⓘ |
| hasNumberOfSpans | 11 ⓘ |
| hasRailConfiguration | two Red Line tracks ⓘ |
| hasTowers | 4 ⓘ |
| hasTrafficDirection | bidirectional road traffic ⓘ |
| isNear |
Charles River Esplanade
ⓘ
Massachusetts General Hospital ⓘ |
| isOnHistoricRoute | connection between downtown Boston and Cambridge ⓘ |
| isSignificantFor | Boston–Cambridge transportation network ⓘ |
| locatedIn |
Boston, Massachusetts
ⓘ
surface form:
Boston
Massachusetts ⓘ United States of America ⓘ
surface form:
United States
|
| maintainedBy | Massachusetts Department of Transportation ⓘ |
| material |
granite
ⓘ
steel ⓘ |
| name | Longfellow Bridge self-link ⓘ |
| namedAfter | Henry Wadsworth Longfellow ⓘ |
| opened | 1906 ⓘ |
| partOf | Charles River crossings in Boston ⓘ |
| replaced | West Boston Bridge ⓘ |
| underwentMajorRehabilitation | 2013–2018 ⓘ |
| usedBy |
bicycles
ⓘ
motor vehicles ⓘ pedestrians ⓘ subway trains ⓘ |
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: Longfellow Bridge Description of subject: Longfellow Bridge is a historic steel and granite bridge in Boston, Massachusetts, known for carrying road and rail traffic between Boston and Cambridge across the Charles River.
Referenced by (14)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Longfellow Bridge, Boston–Cambridge
subject surface form:
Storrow Drive
subject surface form:
Charles River (Boston and Cambridge)