Briones Reservoir
E464342
Briones Reservoir is a man-made lake in Contra Costa County, California, used for water supply and recreational activities such as rowing.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Briones Reservoir canonical | 2 |
| Briones Reservoir area | 1 |
| East Bay Municipal Utility District reservoirs | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T4734122 — 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: Briones Reservoir Context triple: [California Golden Bears women’s rowing, homeBodyOfWater, Briones Reservoir]
-
A.
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.
-
B.
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.
-
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.
Lake Merced
Lake Merced is a freshwater lake and surrounding parkland in southwestern San Francisco, known for recreation, wildlife habitat, and nearby residential and educational areas.
-
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: Briones Reservoir Target entity description: Briones Reservoir is a man-made lake in Contra Costa County, California, used for water supply and recreational activities such as rowing.
-
A.
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.
-
B.
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.
-
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.
Lake Merced
Lake Merced is a freshwater lake and surrounding parkland in southwestern San Francisco, known for recreation, wildlife habitat, and nearby residential and educational areas.
-
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 (39)
| Predicate | Object |
|---|---|
| instanceOf |
man-made lake
ⓘ
reservoir ⓘ |
| accessPolicy |
limited boating under permit
ⓘ
no public swimming ⓘ restricted shoreline access ⓘ |
| basinCountry |
United States
ⓘ
linked to:
United States of America
|
| category |
East Bay Municipal Utility District reservoirs
ⓘ
linked to:
Briones Reservoir
Lakes of the San Francisco Bay Area ⓘ Reservoirs in Contra Costa County, California ⓘ |
| constructionStatus | completed ⓘ |
| country |
United States
ⓘ
linked to:
United States of America
|
| environment |
grassland surroundings
ⓘ
oak woodland surroundings ⓘ |
| function |
emergency water storage
ⓘ
operational storage for East Bay water distribution ⓘ |
| hasNearbyTrail | Briones Reservoir Loop Trail ⓘ |
| impoundedBy | Briones Dam ⓘ |
| locatedIn |
California
ⓘ
linked to:
California, United States
Contra Costa County, California ⓘ
linked to:
Contra Costa County
East Bay ⓘ San Francisco Bay Area ⓘ |
| locatedWithin | Briones Regional Park vicinity ⓘ |
| managedBy | East Bay Municipal Utility District ⓘ |
| near |
Lafayette, California
ⓘ
Martinez, California ⓘ Orinda, California ⓘ |
| operator | East Bay Municipal Utility District ⓘ |
| ownedBy | East Bay Municipal Utility District ⓘ |
| partOf |
East Bay Municipal Utility District water system
ⓘ
linked to:
East Bay Municipal Utility District
|
| primaryUse | municipal water supply ⓘ |
| recreationalActivity |
birdwatching in surrounding area
ⓘ
hiking along surrounding trails ⓘ rowing ⓘ |
| region | Northern California ⓘ |
| use |
recreation
ⓘ
water storage ⓘ |
| waterBodyType | drinking water reservoir ⓘ |
| waterSource |
imported Sierra Nevada water via aqueducts
ⓘ
local 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: Briones Reservoir Description of subject: Briones Reservoir is a man-made lake in Contra Costa County, California, used for water supply and recreational activities such as rowing.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Briones Reservoir
linked to: Briones Reservoir