Castaic Lake
E325101
Castaic Lake is a large reservoir in northern Los Angeles County, California, used for water storage, recreation, and flood control as part of the State Water Project.
All labels observed (4)
| Label | Occurrences |
|---|---|
| Castaic Lake canonical | 6 |
| Castaic Lake State Recreation Area | 4 |
| Castaic Lagoon | 2 |
| Castaic Lake (partly) | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T3083929 — 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: Castaic Lake Context triple: [California Aqueduct, notableReservoirConnection, Castaic Lake]
-
A.
Lake Palmdale
Lake Palmdale is a man-made reservoir in Palmdale, California, popular for outdoor recreation such as fishing, boating, and picnicking.
-
B.
Lake Elsinore
Lake Elsinore is a city in Riverside County, California, known for its large natural freshwater lake, recreational activities, and proximity to major Southern California transportation routes.
-
C.
Hollywood Reservoir
Hollywood Reservoir is a man-made lake in the Hollywood Hills of Los Angeles, known for its scenic walking paths and iconic views of the Hollywood Sign.
-
D.
Lake Arrowhead, California
Lake Arrowhead, California is a scenic mountain resort community in the San Bernardino Mountains known for its alpine lake, outdoor recreation, and role as a training site for elite figure skaters.
-
E.
Lake of the Pines, California
Lake of the Pines, California is a private, gated residential community built around a man-made lake in the Sierra Nevada foothills of Nevada County.
- 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: Castaic Lake Target entity description: Castaic Lake is a large reservoir in northern Los Angeles County, California, used for water storage, recreation, and flood control as part of the State Water Project.
-
A.
Lake Palmdale
Lake Palmdale is a man-made reservoir in Palmdale, California, popular for outdoor recreation such as fishing, boating, and picnicking.
-
B.
Lake Elsinore
Lake Elsinore is a city in Riverside County, California, known for its large natural freshwater lake, recreational activities, and proximity to major Southern California transportation routes.
-
C.
Hollywood Reservoir
Hollywood Reservoir is a man-made lake in the Hollywood Hills of Los Angeles, known for its scenic walking paths and iconic views of the Hollywood Sign.
-
D.
Lake Arrowhead, California
Lake Arrowhead, California is a scenic mountain resort community in the San Bernardino Mountains known for its alpine lake, outdoor recreation, and role as a training site for elite figure skaters.
-
E.
Lake of the Pines, California
Lake of the Pines, California is a private, gated residential community built around a man-made lake in the Sierra Nevada foothills of Nevada County.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
artificial lake
ⓘ
reservoir ⓘ |
| associatedStructure |
Castaic Dam
ⓘ
Castaic Power Plant ⓘ |
| basinCountry |
United States of America
ⓘ
surface form:
United States
|
| country |
United States of America
ⓘ
surface form:
United States
|
| hasFeature |
boat ramps
ⓘ
campgrounds ⓘ day-use areas ⓘ marinas ⓘ |
| hasFishingSpecies |
bluegill
ⓘ
catfish ⓘ crappie ⓘ largemouth bass ⓘ striped bass ⓘ trout ⓘ |
| hasPart |
Castaic Lake
self-linksurface differs
ⓘ
surface form:
Castaic Lagoon
Lower Castaic Lake ⓘ Upper Castaic Lake ⓘ |
| inflow | California Aqueduct ⓘ |
| isReservoirFor | State Water Project deliveries to Southern California ⓘ |
| locatedIn |
California, United States
ⓘ
surface form:
California
Castaic, California ⓘ Los Angeles County ⓘ
surface form:
Los Angeles County, California
northern Los Angeles County ⓘ |
| locatedInProtectedArea |
Castaic Lake
self-linksurface differs
ⓘ
surface form:
Castaic Lake State Recreation Area
|
| managingAgency | California Department of Parks and Recreation ⓘ |
| nearbyCity |
Santa Clarita
ⓘ
surface form:
Santa Clarita, California
|
| nearbyCommunity | Castaic, California ⓘ |
| openedForRecreation | 1970s ⓘ |
| operator |
California Department of Water Resources
ⓘ
Los Angeles County Department of Parks and Recreation ⓘ |
| outflow | Castaic Creek ⓘ |
| partOf |
State Water Project
ⓘ
surface form:
California State Water Project
|
| primaryUse |
flood control
ⓘ
hydroelectric power support ⓘ recreation ⓘ water storage ⓘ |
| recreationActivity |
boating
ⓘ
camping ⓘ fishing ⓘ jet skiing ⓘ picnicking ⓘ sailing ⓘ swimming ⓘ water skiing ⓘ |
| region | Southern California ⓘ |
| watercourse |
Castaic Creek
ⓘ
Santa Clara River watershed ⓘ |
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: Castaic Lake Description of subject: Castaic Lake is a large reservoir in northern Los Angeles County, California, used for water storage, recreation, and flood control as part of the State Water Project.
Referenced by (13)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Castaic Lake State Recreation Area
this entity surface form:
Castaic Lake (partly)
this entity surface form:
Castaic Lagoon
this entity surface form:
Castaic Lake State Recreation Area
this entity surface form:
Castaic Lagoon
this entity surface form:
Castaic Lake State Recreation Area
this entity surface form:
Castaic Lake State Recreation Area