El Capitan Reservoir
E676475
El Capitan Reservoir is a large man-made lake in San Diego County, California, primarily used for municipal water supply and recreational activities such as fishing and boating.
All labels observed (1)
| Label | Occurrences |
|---|---|
| El Capitan Reservoir canonical | 4 |
How this entity was disambiguated
This entity first appeared as the object of triple T7383687 — 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: El Capitan Reservoir Context triple: [San Diego River, hasReservoir, El Capitan Reservoir]
-
A.
Calaveras Reservoir
Calaveras Reservoir is a major water storage reservoir in California’s Diablo Range that supplies drinking water to the San Francisco Bay Area.
-
B.
Briones Reservoir
Briones Reservoir is a man-made lake in Contra Costa County, California, used for water supply and recreational activities such as rowing.
-
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.
Round Valley Reservoir
Round Valley Reservoir is a large man-made lake in New Jersey known for its deep, clear waters, recreational fishing, boating, and surrounding wilderness areas.
-
E.
Martinez Reservoir
Martinez Reservoir is a man-made water storage facility in Contra Costa County, California, used for municipal and irrigation supply as part of the region’s canal and water management system.
- 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: El Capitan Reservoir Target entity description: El Capitan Reservoir is a large man-made lake in San Diego County, California, primarily used for municipal water supply and recreational activities such as fishing and boating.
-
A.
Calaveras Reservoir
Calaveras Reservoir is a major water storage reservoir in California’s Diablo Range that supplies drinking water to the San Francisco Bay Area.
-
B.
Briones Reservoir
Briones Reservoir is a man-made lake in Contra Costa County, California, used for water supply and recreational activities such as rowing.
-
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.
Round Valley Reservoir
Round Valley Reservoir is a large man-made lake in New Jersey known for its deep, clear waters, recreational fishing, boating, and surrounding wilderness areas.
-
E.
Martinez Reservoir
Martinez Reservoir is a man-made water storage facility in Contra Costa County, California, used for municipal and irrigation supply as part of the region’s canal and water management system.
- F. None of above. chosen
Statements (42)
| Predicate | Object |
|---|---|
| instanceOf | reservoir ⓘ |
| accessControlledBy |
City of San Diego
ⓘ
linked to:
San Diego, California, United States
|
| basinCountry |
United States
ⓘ
linked to:
United States of America
|
| category |
Lakes of Southern California
ⓘ
Reservoirs in San Diego County, California ⓘ Water supply reservoirs in the United States ⓘ |
| continent | North America ⓘ |
| country |
United States
ⓘ
linked to:
United States of America
|
| hasActivity |
camping (limited or seasonal, subject to regulations)
ⓘ
water sports ⓘ |
| hasDam | El Capitan Dam ⓘ |
| hasFacility |
boat launch ramp
ⓘ
day-use areas ⓘ |
| hasInflow | San Diego River ⓘ |
| hasOutflow | San Diego River ⓘ |
| hasRecreationalFishing |
bass fishing
ⓘ
catfish fishing ⓘ sunfish and panfish fishing ⓘ |
| locatedIn |
California
ⓘ
linked to:
California, United States
San Diego County, California ⓘ
linked to:
San Diego County
Southern California ⓘ |
| locatedNear |
Alpine, California
ⓘ
linked to:
Alpine, California, United States
Lakeside, California ⓘ |
| locatedOnWatercourse | San Diego River ⓘ |
| managedBy | City of San Diego Public Utilities Department ⓘ |
| manMade | true ⓘ |
| namedAfter |
El Capitan (local geographic feature or historical reference)
ⓘ
linked to:
El Capitan (Arizona)
|
| operator |
City of San Diego
ⓘ
linked to:
San Diego, California, United States
|
| partOf |
San Diego municipal water system
ⓘ
linked to:
San Diego County Water System
|
| primaryUse | municipal water supply ⓘ |
| prohibits | swimming (under most conditions, per municipal rules) ⓘ |
| region | San Diego County ⓘ |
| state |
California
ⓘ
linked to:
California, United States
|
| subjectTo |
boating regulations
ⓘ
drought-related water level fluctuations ⓘ fishing regulations ⓘ |
| supplyFor |
City of San Diego
ⓘ
linked to:
San Diego, California, United States
surrounding communities in San Diego County ⓘ |
| use |
boating
ⓘ
fishing ⓘ recreation ⓘ |
| waterBodyType | freshwater lake ⓘ |
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: El Capitan Reservoir Description of subject: El Capitan Reservoir is a large man-made lake in San Diego County, California, primarily used for municipal water supply and recreational activities such as fishing and boating.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.