Contra Loma Reservoir
E314098
Contra Loma Reservoir is a man-made lake and recreational area in Antioch, California, used for water storage, fishing, and outdoor activities.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Contra Loma Reservoir canonical | 3 |
How this entity was disambiguated
This entity first appeared as the object of triple T2907454 — 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: Contra Loma Reservoir Context triple: [Contra Costa Canal, hasComponent, Contra Loma Reservoir]
-
A.
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.
-
B.
El Pardo Reservoir
El Pardo Reservoir is a dammed water body near Madrid, Spain, primarily used for water supply, flood control, and recreation along the Manzanares River.
-
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.
Don Pedro Reservoir
Don Pedro Reservoir is a large artificial lake in California’s Sierra Nevada foothills, primarily used for water storage, hydroelectric power generation, and recreation.
-
E.
Perris Dam
Perris Dam is a large earthfill embankment dam in Riverside County, California, that forms Lake Perris as part of the state’s major water storage and distribution 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: Contra Loma Reservoir Target entity description: Contra Loma Reservoir is a man-made lake and recreational area in Antioch, California, used for water storage, fishing, and outdoor activities.
-
A.
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.
-
B.
El Pardo Reservoir
El Pardo Reservoir is a dammed water body near Madrid, Spain, primarily used for water supply, flood control, and recreation along the Manzanares River.
-
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.
Don Pedro Reservoir
Don Pedro Reservoir is a large artificial lake in California’s Sierra Nevada foothills, primarily used for water storage, hydroelectric power generation, and recreation.
-
E.
Perris Dam
Perris Dam is a large earthfill embankment dam in Riverside County, California, that forms Lake Perris as part of the state’s major water storage and distribution system.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
man-made lake
ⓘ
recreational area ⓘ reservoir ⓘ |
| basinCountry |
United States
ⓘ
linked to:
United States of America
|
| country |
United States
ⓘ
linked to:
United States of America
|
| hasAccess |
day-use only
ⓘ
pedestrian access ⓘ vehicle access ⓘ |
| hasActivity |
birdwatching
ⓘ
boating ⓘ hiking ⓘ picnicking ⓘ swimming ⓘ |
| hasFacility |
boat launch
ⓘ
parking areas ⓘ picnic areas ⓘ swimming lagoon ⓘ trails ⓘ |
| hasFeature |
designated swimming area
ⓘ
earthen dam ⓘ fishing access points ⓘ grassy picnic areas ⓘ shoreline trails ⓘ |
| hasFishSpecies |
bluegill
ⓘ
catfish ⓘ largemouth bass ⓘ striped bass ⓘ trout ⓘ |
| hasFunction | municipal water supply storage ⓘ |
| hasRegulation |
boating regulations apply
ⓘ
fishing regulations apply ⓘ park hours enforced ⓘ |
| hasWildlife |
raptors
ⓘ
shorebirds ⓘ waterfowl ⓘ |
| locatedIn |
Antioch, California
ⓘ
California ⓘ
linked to:
California, United States
Contra Costa County, California ⓘ
linked to:
Contra Costa County
|
| managingAuthority | East Bay Regional Park District ⓘ |
| near | San Francisco Bay Area ⓘ |
| partOf | Contra Loma Regional Park ⓘ |
| region | East Bay ⓘ |
| use |
fishing
ⓘ
outdoor activities ⓘ recreation ⓘ water storage ⓘ |
| 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: Contra Loma Reservoir Description of subject: Contra Loma Reservoir is a man-made lake and recreational area in Antioch, California, used for water storage, fishing, and outdoor activities.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.