Crystal Springs Reservoir
E71762
Crystal Springs Reservoir is a large artificial lake system on the San Francisco Peninsula that serves as a major drinking water source and scenic open-space area for the region.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Crystal Springs Reservoir canonical | 13 |
| Lower Crystal Springs Reservoir | 6 |
| Upper Crystal Springs Reservoir | 5 |
How this entity was disambiguated
This entity first appeared as the object of triple T507181 — 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: Crystal Springs Reservoir Context triple: [San Mateo County, California, contains, Crystal Springs Reservoir]
-
A.
Hillview Reservoir
Hillview Reservoir is a key New York City water storage facility that serves as the final holding basin for treated water before it enters the city’s distribution system.
-
B.
Amawalk Reservoir
Amawalk Reservoir is a man-made lake in Westchester County, New York, that forms part of New York City's Croton water supply 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.
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.
-
E.
Muscoot Reservoir
Muscoot Reservoir is a man-made lake in Westchester County, New York, that serves as a key component of New York City’s Croton water supply 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: Crystal Springs Reservoir Target entity description: Crystal Springs Reservoir is a large artificial lake system on the San Francisco Peninsula that serves as a major drinking water source and scenic open-space area for the region.
-
A.
Hillview Reservoir
Hillview Reservoir is a key New York City water storage facility that serves as the final holding basin for treated water before it enters the city’s distribution system.
-
B.
Amawalk Reservoir
Amawalk Reservoir is a man-made lake in Westchester County, New York, that forms part of New York City's Croton water supply 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.
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.
-
E.
Muscoot Reservoir
Muscoot Reservoir is a man-made lake in Westchester County, New York, that serves as a key component of New York City’s Croton water supply system.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
artificial lake system
ⓘ
drinking water reservoir ⓘ reservoir ⓘ |
| adjacentTo | Interstate 280 ⓘ |
| basinCountry |
United States of America
ⓘ
surface form:
United States
|
| country |
United States of America
ⓘ
surface form:
United States
|
| createdFor | drinking water storage ⓘ |
| crossedBy | Interstate 280 ⓘ |
| elevation | approximately 140 feet above sea level ⓘ |
| environmentType | Mediterranean-climate coastal hills ⓘ |
| formedBy | Crystal Springs Dam ⓘ |
| hasPart |
Crystal Springs Reservoir
self-linksurface differs
ⓘ
surface form:
Lower Crystal Springs Reservoir
Crystal Springs Reservoir self-linksurface differs ⓘ
surface form:
Upper Crystal Springs Reservoir
|
| hasRecreation | Crystal Springs Regional Trail nearby ⓘ |
| hasVegetation |
chaparral around shores
ⓘ
oak woodland around shores ⓘ |
| hasWildlife |
deer
ⓘ
other native Bay Area species ⓘ raptors ⓘ waterfowl ⓘ |
| locatedIn |
San Andreas Rift Valley
ⓘ
San Mateo County, California ⓘ |
| locatedNear |
Burlingame
ⓘ
surface form:
Burlingame, California
Hillsborough, California ⓘ San Andreas Lake ⓘ San Mateo, California, United States ⓘ
surface form:
San Mateo, California
|
| locatedOn | San Francisco Peninsula ⓘ |
| managedBy | San Francisco Public Utilities Commission ⓘ |
| nearbyFeature |
Pulgas Water Temple
ⓘ
Sawyer Camp Trail ⓘ |
| partOf |
San Francisco Peninsula reservoir system
ⓘ
surface form:
San Francisco Peninsula watershed
San Francisco Public Utilities Commission ⓘ
surface form:
San Francisco Public Utilities Commission water system
|
| primaryInflow |
Hetch Hetchy Aqueduct deliveries
ⓘ
local watershed runoff ⓘ |
| primaryOutflow | San Mateo Creek ⓘ |
| restrictedActivity |
no public boating
ⓘ
no public fishing ⓘ no public swimming ⓘ |
| state |
California, United States
ⓘ
surface form:
California
|
| surroundedBy |
protected watershed lands
ⓘ
scenic open space ⓘ |
| usedFor |
municipal water supply
ⓘ
recreation in surrounding open space ⓘ |
| waterSourceFor |
San Francisco
ⓘ
San Francisco Bay Area ⓘ San Mateo County communities ⓘ |
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: Crystal Springs Reservoir Description of subject: Crystal Springs Reservoir is a large artificial lake system on the San Francisco Peninsula that serves as a major drinking water source and scenic open-space area for the region.
Referenced by (24)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Upper Crystal Springs Reservoir
this entity surface form:
Lower Crystal Springs Reservoir
this entity surface form:
Upper Crystal Springs Reservoir
this entity surface form:
Lower Crystal Springs Reservoir
this entity surface form:
Lower Crystal Springs Reservoir
this entity surface form:
Upper Crystal Springs Reservoir
this entity surface form:
Lower Crystal Springs Reservoir
this entity surface form:
Lower Crystal Springs Reservoir
this entity surface form:
Upper Crystal Springs Reservoir
this entity surface form:
Lower Crystal Springs Reservoir
this entity surface form:
Upper Crystal Springs Reservoir