Upper Otay Reservoir
E819925
Upper Otay Reservoir is a small man-made lake in San Diego County, California, primarily used for water storage and recreational activities such as fishing and wildlife observation.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Upper Otay Reservoir canonical | 3 |
| Upper Otay Lake | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T9767200 — 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: Upper Otay Reservoir Context triple: [Otay River, impoundedBy, Upper Otay Reservoir]
-
A.
San Carlos Reservoir
San Carlos Reservoir is a large artificial lake on the Gila River in Arizona, primarily used for irrigation, flood control, and recreation.
-
B.
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.
-
C.
San Luis Reservoir
San Luis Reservoir is a large artificial lake in California that serves as a major water storage facility for irrigation and municipal use in the state’s Central Valley.
-
D.
La Paloma Reservoir
La Paloma Reservoir is a major artificial lake in Chile’s Coquimbo Region, known for supporting irrigation and water supply in the Monte Patria area.
-
E.
Contra Loma Reservoir
Contra Loma Reservoir is a man-made lake and recreational area in Antioch, California, used for water storage, fishing, and outdoor activities.
- 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: Upper Otay Reservoir Target entity description: Upper Otay Reservoir is a small man-made lake in San Diego County, California, primarily used for water storage and recreational activities such as fishing and wildlife observation.
-
A.
San Carlos Reservoir
San Carlos Reservoir is a large artificial lake on the Gila River in Arizona, primarily used for irrigation, flood control, and recreation.
-
B.
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.
-
C.
San Luis Reservoir
San Luis Reservoir is a large artificial lake in California that serves as a major water storage facility for irrigation and municipal use in the state’s Central Valley.
-
D.
La Paloma Reservoir
La Paloma Reservoir is a major artificial lake in Chile’s Coquimbo Region, known for supporting irrigation and water supply in the Monte Patria area.
-
E.
Contra Loma Reservoir
Contra Loma Reservoir is a man-made lake and recreational area in Antioch, California, used for water storage, fishing, and outdoor activities.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
body of water
ⓘ
reservoir ⓘ |
| access | limited public access ⓘ |
| basinCountry |
United States
ⓘ
linked to:
United States of America
|
| continent | North America ⓘ |
| country |
United States
ⓘ
linked to:
United States of America
|
| hasActivityRestriction |
no body contact with water
ⓘ
no swimming ⓘ restricted boating ⓘ |
| hasConservationRole |
bird habitat
ⓘ
wildlife conservation area ⓘ |
| hasEcosystemType | freshwater lake ⓘ |
| hasFeature |
earthen dam
ⓘ
shoreline fishing access ⓘ surrounding open space ⓘ wildlife habitat ⓘ |
| hasFishSpecies |
catfish
ⓘ
largemouth bass ⓘ sunfish ⓘ |
| hasRecreationType | day-use recreation ⓘ |
| hasShoreline | natural shoreline ⓘ |
| hasVegetation |
aquatic plants
ⓘ
riparian vegetation ⓘ |
| locatedIn |
California
ⓘ
linked to:
California, United States
Otay area of San Diego County ⓘ San Diego County, California ⓘ
linked to:
San Diego County
Southern California ⓘ |
| locatedNear |
Lower Otay Reservoir
ⓘ
Otay Mountain ⓘ
linked to:
Otay Mountain Wilderness
|
| managedBy |
City of San Diego
ⓘ
linked to:
San Diego
|
| nearCity |
Chula Vista, California
ⓘ
linked to:
Chula Vista
San Diego, California ⓘ
linked to:
San Diego, California, United States
|
| ownedBy |
City of San Diego
ⓘ
linked to:
San Diego
|
| partOf |
Otay River watershed
ⓘ
linked to:
Otay River
San Diego water supply system ⓘ
linked to:
San Diego County Water System
|
| primaryUse | water storage ⓘ |
| region | San Diego County ⓘ |
| state |
California
ⓘ
linked to:
California, United States
|
| surroundedBy |
chaparral habitat
ⓘ
coastal sage scrub ⓘ |
| usedFor |
birdwatching
ⓘ
fishing ⓘ recreation ⓘ sport fishing ⓘ wildlife observation ⓘ |
| watercourse | Otay River ⓘ |
| waterType | freshwater ⓘ |
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: Upper Otay Reservoir Description of subject: Upper Otay Reservoir is a small man-made lake in San Diego County, California, primarily used for water storage and recreational activities such as fishing and wildlife observation.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Upper Otay Reservoir