Lake Mead
E40441
Lake Mead is a large man-made reservoir on the Colorado River in the southwestern United States, known for supplying water and hydroelectric power to millions of people in the region.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Lake Mead canonical | 34 |
| Black Canyon Reservoir (Hoover Dam reservoir section) | 1 |
| Lake Mead reservoir | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T303306 — 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: Lake Mead Context triple: [Hoover Dam, reservoir, Lake Mead]
-
A.
Lake Mead National Recreation Area
Lake Mead National Recreation Area is a vast protected landscape in the American Southwest centered on the reservoirs of the Colorado River, offering desert scenery, water-based recreation, and wildlife habitat.
-
B.
Pyramid Lake
Pyramid Lake is a large desert lake in northwestern Nevada known for its striking pyramid-shaped tufa formations and cultural significance to the Pyramid Lake Paiute Tribe.
-
C.
Donner Lake
Donner Lake is a scenic alpine lake in the Sierra Nevada of California, known for its clear waters, recreational activities, and historical association with the Donner Party.
-
D.
Lake Tahoe
Lake Tahoe is a large, deep, and famously clear freshwater lake in the Sierra Nevada mountains, straddling the border of California and Nevada and serving as a major destination for outdoor recreation and tourism.
-
E.
Salton Sea
The Salton Sea is a large, saline, endorheic lake in the Colorado Desert of Southern California, known for its fluctuating water levels, high salinity, and significant environmental and ecological challenges.
- 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: Lake Mead Target entity description: Lake Mead is a large man-made reservoir on the Colorado River in the southwestern United States, known for supplying water and hydroelectric power to millions of people in the region.
-
A.
Lake Mead National Recreation Area
Lake Mead National Recreation Area is a vast protected landscape in the American Southwest centered on the reservoirs of the Colorado River, offering desert scenery, water-based recreation, and wildlife habitat.
-
B.
Pyramid Lake
Pyramid Lake is a large desert lake in northwestern Nevada known for its striking pyramid-shaped tufa formations and cultural significance to the Pyramid Lake Paiute Tribe.
-
C.
Donner Lake
Donner Lake is a scenic alpine lake in the Sierra Nevada of California, known for its clear waters, recreational activities, and historical association with the Donner Party.
-
D.
Lake Tahoe
Lake Tahoe is a large, deep, and famously clear freshwater lake in the Sierra Nevada mountains, straddling the border of California and Nevada and serving as a major destination for outdoor recreation and tourism.
-
E.
Salton Sea
The Salton Sea is a large, saline, endorheic lake in the Colorado Desert of Southern California, known for its fluctuating water levels, high salinity, and significant environmental and ecological challenges.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
body of water
ⓘ
man-made lake ⓘ reservoir ⓘ |
| basinCountry |
United States of America
ⓘ
surface form:
United States
|
| borderedBy |
Mojave Desert
ⓘ
Sonoran Desert ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| created | 1930s ⓘ |
| formedByDam | Hoover Dam ⓘ |
| hasIsland |
Boulder Islands
ⓘ
Pyramid Island ⓘ Sentinel Island ⓘ |
| hasIssue |
declining water levels
ⓘ
drought impacts ⓘ water scarcity ⓘ |
| inflow | Colorado River ⓘ |
| locatedIn |
southwestern United States
ⓘ
surface form:
Southwestern United States
|
| locatedInState |
Arizona
ⓘ
Nevada ⓘ |
| locatedOnRiver | Colorado River ⓘ |
| managedBy |
Bureau of Reclamation
ⓘ
surface form:
United States Bureau of Reclamation
|
| maximumCapacity |
about 26 million acre-feet
ⓘ
about 32.2 cubic kilometers ⓘ |
| maximumDepth |
about 162 meters
ⓘ
about 532 feet ⓘ |
| namedAfter | Elwood Mead ⓘ |
| nearCity |
Boulder City, Nevada
ⓘ
Henderson, Nevada ⓘ Las Vegas, Nevada ⓘ
surface form:
Las Vegas
|
| opened | 1936 ⓘ |
| outflow | Colorado River ⓘ |
| partOf |
Lake Mead National Recreation Area
ⓘ
Lower Colorado River region ⓘ
surface form:
Lower Colorado River Basin
|
| recreationActivity |
boating
ⓘ
camping ⓘ fishing ⓘ swimming ⓘ |
| surfaceArea |
about 247 square miles
ⓘ
about 640 square kilometers ⓘ |
| usedFor |
flood control
ⓘ
hydroelectric power generation ⓘ irrigation ⓘ municipal water supply ⓘ recreation ⓘ |
| waterSupplyFor |
Arizona
ⓘ
California, United States ⓘ
surface form:
California
Las Vegas Valley ⓘ Mexico ⓘ Nevada ⓘ |
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: Lake Mead Description of subject: Lake Mead is a large man-made reservoir on the Colorado River in the southwestern United States, known for supplying water and hydroelectric power to millions of people in the region.
Referenced by (36)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Black Canyon Reservoir (Hoover Dam reservoir section)
subject surface form:
Southern Nevada
subject surface form:
Southern Nevada
this entity surface form:
Lake Mead reservoir