Cannonsville Dam
E826741
Cannonsville Dam is a large earth-fill dam in Delaware County, New York, that impounds the West Branch of the Delaware River as part of New York City's upstate water supply system.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Cannonsville Dam canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T9082957 — 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: Cannonsville Dam Context triple: [Cannonsville Reservoir, createdBy, Cannonsville Dam]
-
A.
Palisade Dam
Palisade Dam is an irrigation and water storage structure located on the Sevier River in central Utah, supporting local agriculture and recreation.
-
B.
Island Park Dam
Island Park Dam is an earthfill dam on the Henrys Fork of the Snake River in eastern Idaho, primarily used for irrigation water storage and flood control.
-
C.
O'Shaughnessy Dam
O'Shaughnessy Dam is a concrete arch-gravity dam in Yosemite National Park that creates the Hetch Hetchy Reservoir, supplying water and hydroelectric power to the San Francisco Bay Area.
-
D.
Cascade Dam
Cascade Dam is a hydroelectric and flood-control structure located on the Thornapple River in Michigan.
-
E.
Libby Dam
Libby Dam is a large hydroelectric and flood-control dam on the Kootenai River in Montana that contributes significant power and water management capacity to the Columbia River Basin.
- 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: Cannonsville Dam Target entity description: Cannonsville Dam is a large earth-fill dam in Delaware County, New York, that impounds the West Branch of the Delaware River as part of New York City's upstate water supply system.
-
A.
Palisade Dam
Palisade Dam is an irrigation and water storage structure located on the Sevier River in central Utah, supporting local agriculture and recreation.
-
B.
Island Park Dam
Island Park Dam is an earthfill dam on the Henrys Fork of the Snake River in eastern Idaho, primarily used for irrigation water storage and flood control.
-
C.
O'Shaughnessy Dam
O'Shaughnessy Dam is a concrete arch-gravity dam in Yosemite National Park that creates the Hetch Hetchy Reservoir, supplying water and hydroelectric power to the San Francisco Bay Area.
-
D.
Cascade Dam
Cascade Dam is a hydroelectric and flood-control structure located on the Thornapple River in Michigan.
-
E.
Libby Dam
Libby Dam is a large hydroelectric and flood-control dam on the Kootenai River in Montana that contributes significant power and water management capacity to the Columbia River Basin.
- F. None of above. chosen
Statements (40)
| Predicate | Object |
|---|---|
| instanceOf |
earth-fill dam
ⓘ
embankment dam ⓘ |
| basinCountry |
United States of America
ⓘ
surface form:
United States
|
| causedInundationOf | Cannonsville, New York NERFINISHED ⓘ |
| completedIn | 1964 ⓘ |
| constructionBegan | 1955 ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| createsReservoir | Cannonsville Reservoir NERFINISHED ⓘ |
| hasSpillway | overflow spillway ⓘ |
| height | about 175 feet ⓘ |
| impounds | West Branch Delaware River NERFINISHED ⓘ |
| latitudeApprox | 42.05°N ⓘ |
| length | about 2,800 feet ⓘ |
| locatedIn |
Delaware County, New York
NERFINISHED
ⓘ
New York State NERFINISHED ⓘ |
| locatedInCounty | Delaware County NERFINISHED ⓘ |
| locatedInWatershed | Delaware River watershed NERFINISHED ⓘ |
| locatedNear | Deposit, New York NERFINISHED ⓘ |
| locatedOnRiver | West Branch Delaware River NERFINISHED ⓘ |
| longitudeApprox | 75.33°W ⓘ |
| managesFlowTo | Delaware River NERFINISHED ⓘ |
| material | earth and rock fill ⓘ |
| namedAfter | former community of Cannonsville ⓘ |
| oneOf |
New York City Delaware System reservoirs
NERFINISHED
ⓘ
New York City upstate reservoirs ⓘ |
| openingYear | 1964 ⓘ |
| operatedBy | New York City Department of Environmental Protection NERFINISHED ⓘ |
| ownedBy |
New York City
ⓘ
surface form:
City of New York
|
| partOf |
New York City Delaware System
NERFINISHED
ⓘ
New York City water supply system NERFINISHED ⓘ |
| purpose |
flood control
ⓘ
municipal water supply ⓘ recreation ⓘ |
| regionServed | New York City metropolitan area NERFINISHED ⓘ |
| reservoirCapacity | about 95 billion US gallons ⓘ |
| reservoirName | Cannonsville Reservoir NERFINISHED ⓘ |
| reservoirSurfaceArea | about 4,700 acres ⓘ |
| riverSystem | Delaware River NERFINISHED ⓘ |
| state | New York ⓘ |
| waterSupplyFor | New York City NERFINISHED ⓘ |
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: Cannonsville Dam Description of subject: Cannonsville Dam is a large earth-fill dam in Delaware County, New York, that impounds the West Branch of the Delaware River as part of New York City's upstate water supply system.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.