Union Valley Reservoir
E128946
Union Valley Reservoir is a large man-made lake in California’s Sierra Nevada used for recreation and hydroelectric power within Eldorado National Forest.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Union Valley Reservoir canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T844166 — 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: Union Valley Reservoir Context triple: [Eldorado National Forest, contains, Union Valley Reservoir]
-
A.
East Branch Reservoir
East Branch Reservoir is a man-made water supply reservoir in New York’s Croton Watershed that helps provide drinking water to New York City.
-
B.
Middle Branch Reservoir
Middle Branch Reservoir is a man-made lake in New York’s Croton Watershed that serves as part of the New York City water supply system.
-
C.
Silver Lake Reservoir
Silver Lake Reservoir is a man-made urban lake and surrounding recreational area in Los Angeles, California, known for its walking paths, scenic views, and role as a local water storage facility.
-
D.
Ashokan Reservoir
Ashokan Reservoir is a major New York City water supply reservoir located in the Catskill Mountains of Ulster County, New York.
-
E.
West Branch Reservoir
West Branch Reservoir is a man-made water body in New York that serves as part of the New York City water supply system and offers limited recreational opportunities.
- 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: Union Valley Reservoir Target entity description: Union Valley Reservoir is a large man-made lake in California’s Sierra Nevada used for recreation and hydroelectric power within Eldorado National Forest.
-
A.
East Branch Reservoir
East Branch Reservoir is a man-made water supply reservoir in New York’s Croton Watershed that helps provide drinking water to New York City.
-
B.
Middle Branch Reservoir
Middle Branch Reservoir is a man-made lake in New York’s Croton Watershed that serves as part of the New York City water supply system.
-
C.
Silver Lake Reservoir
Silver Lake Reservoir is a man-made urban lake and surrounding recreational area in Los Angeles, California, known for its walking paths, scenic views, and role as a local water storage facility.
-
D.
Ashokan Reservoir
Ashokan Reservoir is a major New York City water supply reservoir located in the Catskill Mountains of Ulster County, New York.
-
E.
West Branch Reservoir
West Branch Reservoir is a man-made water body in New York that serves as part of the New York City water supply system and offers limited recreational opportunities.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
body of water
ⓘ
man-made lake ⓘ reservoir ⓘ |
| basinCountry |
United States of America
ⓘ
surface form:
United States
|
| country |
United States of America
ⓘ
surface form:
United States
|
| county | El Dorado County, California ⓘ |
| elevation |
about 4900 feet
ⓘ
approximately 1490 meters ⓘ |
| fishSpecies |
brown trout
ⓘ
kokanee salmon ⓘ lake trout ⓘ largemouth bass ⓘ rainbow trout ⓘ smallmouth bass ⓘ |
| hasCampground |
Fashoda Campground
ⓘ
Wench Creek Campground ⓘ
surface form:
Sunset Campground
Wench Creek Campground ⓘ Yellowjacket Campground ⓘ |
| hasFeature |
boat ramps
ⓘ
picnic areas ⓘ trails ⓘ |
| locatedIn |
Eldorado National Forest
ⓘ
Sierra Nevada ⓘ western slope of the Sierra Nevada ⓘ |
| managingAgency |
Eldorado National Forest
ⓘ
U.S. Forest Service ⓘ |
| nearbyCity |
Placerville
ⓘ
surface form:
Placerville, California
|
| operator | Sacramento Municipal Utility District ⓘ |
| partOf |
American River watershed
ⓘ
Upper American River Project ⓘ |
| primaryInflow | Silver Creek ⓘ |
| primaryOutflow | Silver Creek ⓘ |
| purpose |
hydroelectric power generation
ⓘ
recreation ⓘ |
| recreationalActivity |
boating
ⓘ
camping ⓘ fishing ⓘ hiking ⓘ swimming ⓘ water skiing ⓘ |
| state |
California, United States
ⓘ
surface form:
California
|
| surfaceArea |
about 2770 acres
ⓘ
approximately 11.2 square kilometers ⓘ |
| usedFor |
flood control
ⓘ
peaking power generation ⓘ water storage ⓘ |
| watercourse | Silver Creek ⓘ |
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: Union Valley Reservoir Description of subject: Union Valley Reservoir is a large man-made lake in California’s Sierra Nevada used for recreation and hydroelectric power within Eldorado National Forest.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.