Whittier Narrows Dam
E928357
Whittier Narrows Dam is a large flood-control and water-conservation structure in Los Angeles County, California, that manages flows from the San Gabriel and Rio Hondo rivers.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Whittier Narrows Dam canonical | 3 |
How this entity was disambiguated
This entity first appeared as the object of triple T11460538 — 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: Whittier Narrows Dam Context triple: [San Gabriel River, hasStructure, Whittier Narrows Dam]
-
A.
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.
-
B.
Castaic Dam
Castaic Dam is a large embankment dam in Los Angeles County, California, that forms Castaic Lake and plays a key role in water storage and hydroelectric power generation for Southern California.
-
C.
Hollywood Dam
Hollywood Dam is a concrete arch-gravity dam in the Hollywood Hills of Los Angeles that impounds the Hollywood Reservoir as part of the city’s water supply system.
-
D.
El Capitan Dam
El Capitan Dam is a large concrete arch dam in San Diego County, California, built for water storage, flood control, and recreation.
-
E.
Folsom Dam
Folsom Dam is a large concrete dam on the American River in California that provides flood control, water storage, and hydroelectric power for the Sacramento region.
- 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: Whittier Narrows Dam Target entity description: Whittier Narrows Dam is a large flood-control and water-conservation structure in Los Angeles County, California, that manages flows from the San Gabriel and Rio Hondo rivers.
-
A.
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.
-
B.
Castaic Dam
Castaic Dam is a large embankment dam in Los Angeles County, California, that forms Castaic Lake and plays a key role in water storage and hydroelectric power generation for Southern California.
-
C.
Hollywood Dam
Hollywood Dam is a concrete arch-gravity dam in the Hollywood Hills of Los Angeles that impounds the Hollywood Reservoir as part of the city’s water supply system.
-
D.
El Capitan Dam
El Capitan Dam is a large concrete arch dam in San Diego County, California, built for water storage, flood control, and recreation.
-
E.
Folsom Dam
Folsom Dam is a large concrete dam on the American River in California that provides flood control, water storage, and hydroelectric power for the Sacramento region.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
flood control dam
ⓘ
water conservation structure ⓘ |
| associatedWithProject | Los Angeles County Drainage Area project NERFINISHED ⓘ |
| basinType | multipurpose flood control basin ⓘ |
| completedIn | 1957 ⓘ |
| constructionBegan | 1950s ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| crosses |
Rio Hondo
NERFINISHED
ⓘ
San Gabriel River NERFINISHED ⓘ |
| downstreamTo | Los Angeles River system NERFINISHED ⓘ |
| hasFunction |
protect downstream communities from flooding
ⓘ
regulate storm runoff ⓘ store water for groundwater recharge ⓘ |
| hasRecreationArea | Whittier Narrows Recreation Area NERFINISHED ⓘ |
| hasSpillway | concrete spillway ⓘ |
| locatedIn |
California, United States
ⓘ
surface form:
California
Los Angeles County ⓘ
surface form:
Los Angeles County, California
San Gabriel Valley NERFINISHED ⓘ |
| locatedInProtectedArea | Whittier Narrows Recreation Area NERFINISHED ⓘ |
| locatedInValley | Whittier Narrows NERFINISHED ⓘ |
| locatedNear |
Montebello, California
NERFINISHED
ⓘ
Pico Rivera, California NERFINISHED ⓘ Rosemead, California NERFINISHED ⓘ |
| locatedNearInfrastructure |
Interstate 10
NERFINISHED
ⓘ
Interstate 605 NERFINISHED ⓘ State Route 60 NERFINISHED ⓘ |
| locatedOnWatercourse |
Rio Hondo
NERFINISHED
ⓘ
San Gabriel River NERFINISHED ⓘ |
| maintainedBy | United States Army Corps of Engineers NERFINISHED ⓘ |
| managesFlowOf |
Rio Hondo
NERFINISHED
ⓘ
San Gabriel River NERFINISHED ⓘ |
| material |
earth-fill
ⓘ
embankment ⓘ |
| nearbyCity | Los Angeles NERFINISHED ⓘ |
| operator | United States Army Corps of Engineers Los Angeles District NERFINISHED ⓘ |
| owner | United States Army Corps of Engineers NERFINISHED ⓘ |
| partOf |
Los Angeles County drainage system
ⓘ
Los Angeles County flood control system NERFINISHED ⓘ |
| protects |
downstream communities along the Rio Hondo
ⓘ
downstream communities along the San Gabriel River ⓘ |
| purpose |
flood control
ⓘ
groundwater recharge ⓘ water conservation ⓘ |
| regionServed |
Los Angeles County
NERFINISHED
ⓘ
San Gabriel Valley communities ⓘ |
| riskClassification | high risk dam (USACE designation) ⓘ |
| separates |
Rio Hondo watershed
ⓘ
San Gabriel River watershed NERFINISHED ⓘ |
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: Whittier Narrows Dam Description of subject: Whittier Narrows Dam is a large flood-control and water-conservation structure in Los Angeles County, California, that manages flows from the San Gabriel and Rio Hondo rivers.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.