Great Johnstown Flood of 1889
E831977
The Great Johnstown Flood of 1889 was a catastrophic dam failure–induced deluge that devastated Johnstown, Pennsylvania, killing more than 2,200 people and becoming one of the deadliest and most infamous disasters in U.S. history.
All labels observed (6)
| Label | Occurrences |
|---|---|
| The Johnstown Flood | 2 |
| Great Johnstown Flood of 1889 canonical | 1 |
| Johnstown Flood of 1889 | 1 |
| Johnstown Flood of 1936 | 1 |
| Johnstown Flood of 1977 | 1 |
| Johnstown Floods | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T9962269 — 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: Great Johnstown Flood of 1889 Context triple: [Johnstown, Pennsylvania, knownFor, Great Johnstown Flood of 1889]
-
A.
Great Flood of 1879
The Great Flood of 1879 was a catastrophic inundation of the city of Szeged in Hungary that destroyed most of the town and prompted a major reconstruction.
-
B.
The Great Flood of 1852
The Great Flood of 1852 was a catastrophic inundation of the Murrumbidgee River that devastated the Australian town of Gundagai, causing extensive loss of life and prompting the town’s relocation to higher ground.
-
C.
Hartford Flood of 1936
The Hartford Flood of 1936 was a devastating spring flood that inundated Hartford, Connecticut and surrounding areas, causing widespread damage and prompting major flood-control improvements along the city’s rivers.
-
D.
Great Sioux City Flood of 1892
The Great Sioux City Flood of 1892 was a devastating late-19th-century flood that inundated Sioux City, Iowa, causing widespread destruction and loss of life along the Missouri River.
-
E.
1967 Fairbanks flood
The 1967 Fairbanks flood was a devastating inundation of Fairbanks, Alaska, that caused widespread damage and led to major changes in the region’s flood control and urban planning.
- 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: Great Johnstown Flood of 1889 Target entity description: The Great Johnstown Flood of 1889 was a catastrophic dam failure–induced deluge that devastated Johnstown, Pennsylvania, killing more than 2,200 people and becoming one of the deadliest and most infamous disasters in U.S. history.
-
A.
Great Flood of 1879
The Great Flood of 1879 was a catastrophic inundation of the city of Szeged in Hungary that destroyed most of the town and prompted a major reconstruction.
-
B.
The Great Flood of 1852
The Great Flood of 1852 was a catastrophic inundation of the Murrumbidgee River that devastated the Australian town of Gundagai, causing extensive loss of life and prompting the town’s relocation to higher ground.
-
C.
Hartford Flood of 1936
The Hartford Flood of 1936 was a devastating spring flood that inundated Hartford, Connecticut and surrounding areas, causing widespread damage and prompting major flood-control improvements along the city’s rivers.
-
D.
Great Sioux City Flood of 1892
The Great Sioux City Flood of 1892 was a devastating late-19th-century flood that inundated Sioux City, Iowa, causing widespread destruction and loss of life along the Missouri River.
-
E.
1967 Fairbanks flood
The 1967 Fairbanks flood was a devastating inundation of Fairbanks, Alaska, that caused widespread damage and led to major changes in the region’s flood control and urban planning.
- F. None of above. chosen
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
dam failure disaster
ⓘ
flood ⓘ |
| affects |
Conemaugh Valley
NERFINISHED
ⓘ
Johnstown, Pennsylvania NERFINISHED ⓘ |
| alsoKnownAs |
Johnstown Flood
NERFINISHED
ⓘ
Johnstown Flood of 1889 NERFINISHED ⓘ |
| associatedOrganization | South Fork Fishing and Hunting Club NERFINISHED ⓘ |
| commemoratedOn | annual observances on May 31 in Johnstown ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| damage | extensive destruction of Johnstown, Pennsylvania ⓘ |
| damInvolved | South Fork Dam NERFINISHED ⓘ |
| deadliestIn | Pennsylvania history ⓘ |
| deathToll | >2200 ⓘ |
| documentedIn |
books
ⓘ
documentary films ⓘ newspaper accounts ⓘ photographs ⓘ |
| estimatedPropertyDamage | approximately $17 million (1889 USD) ⓘ |
| firstMajorPeacetimeOperationOf | American Red Cross GENERATED ⓘ |
| floodType | dam-break flood ⓘ |
| followedBy | major relief effort by the American Red Cross ⓘ |
| hasCause |
failure of the South Fork Dam
ⓘ
heavy rainfall ⓘ |
| historicalSignificance | catalyst for reforms in dam safety awareness in the United States ⓘ |
| impactOnLaw | influenced later discussions of strict liability for dam owners ⓘ |
| legalOutcome | no successful civil or criminal liability for dam owners ⓘ |
| locatedIn | Johnstown, Pennsylvania NERFINISHED ⓘ |
| locatedInAdministrativeEntity |
Cambria County, Pennsylvania
NERFINISHED
ⓘ
Pennsylvania NERFINISHED ⓘ |
| locatedInTimeZone | Eastern Time Zone ⓘ |
| mainCause | breach of the South Fork Dam ⓘ |
| memorializedBy | Johnstown Flood National Memorial NERFINISHED ⓘ |
| memorialLocatedAt | South Fork Dam site NERFINISHED ⓘ |
| notablePersonInvolved |
Andrew Carnegie (member of South Fork Fishing and Hunting Club)
NERFINISHED
ⓘ
Andrew Mellon (member of South Fork Fishing and Hunting Club) NERFINISHED ⓘ Henry Clay Frick (member of South Fork Fishing and Hunting Club) NERFINISHED ⓘ |
| oneOfDeadliest | disasters in U.S. history ⓘ |
| partOf |
history of American disasters in the 19th century
ⓘ
history of Johnstown, Pennsylvania ⓘ |
| pointInTime | 1889-05-31 ⓘ |
| precededBy | days of heavy rain in late May 1889 ⓘ |
| reliefLeader | Clara Barton NERFINISHED ⓘ |
| reliefOrganization | American Red Cross NERFINISHED ⓘ |
| riverSystem |
Conemaugh River
NERFINISHED
ⓘ
Little Conemaugh River NERFINISHED ⓘ |
| speedOfFloodWave | up to about 40 miles per hour ⓘ |
| startDate | 1889-05-31 ⓘ |
| timeToReachTown | about 57 minutes after dam failure ⓘ |
| waterSource | Lake Conemaugh NERFINISHED ⓘ |
| waveHeight | up to about 60 feet ⓘ |
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: Great Johnstown Flood of 1889 Description of subject: The Great Johnstown Flood of 1889 was a catastrophic dam failure–induced deluge that devastated Johnstown, Pennsylvania, killing more than 2,200 people and becoming one of the deadliest and most infamous disasters in U.S. history.
Referenced by (7)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Johnstown Flood of 1889
this entity surface form:
Johnstown Flood of 1936
this entity surface form:
Johnstown Flood of 1977
this entity surface form:
Johnstown Floods
this entity surface form:
The Johnstown Flood
this entity surface form:
The Johnstown Flood