Lake Powell
E148089
Lake Powell is a large, man-made reservoir on the Colorado River known for its striking red-rock canyon scenery and recreational boating in the American Southwest.
All labels observed (4)
| Label | Occurrences |
|---|---|
| Lake Powell canonical | 20 |
| Glen Canyon | 1 |
| Lake Powell (Arizona portion) | 1 |
| Lake Powell marinas | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T1128564 — 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 Powell Context triple: [Colorado Plateau, contains, Lake Powell]
-
A.
Lake Mead
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.
-
B.
Lake Havasu
Lake Havasu is a large reservoir on the Colorado River along the Arizona–California border, popular for boating, fishing, and the relocated London Bridge tourist attraction.
-
C.
Lake Mohave
Lake Mohave is a large reservoir on the Colorado River along the Arizona–Nevada border, popular for boating, fishing, and other water recreation within the Lake Mead National Recreation Area.
-
D.
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.
-
E.
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.
- 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 Powell Target entity description: Lake Powell is a large, man-made reservoir on the Colorado River known for its striking red-rock canyon scenery and recreational boating in the American Southwest.
-
A.
Lake Mead
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.
-
B.
Lake Havasu
Lake Havasu is a large reservoir on the Colorado River along the Arizona–California border, popular for boating, fishing, and the relocated London Bridge tourist attraction.
-
C.
Lake Mohave
Lake Mohave is a large reservoir on the Colorado River along the Arizona–Nevada border, popular for boating, fishing, and other water recreation within the Lake Mead National Recreation Area.
-
D.
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.
-
E.
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.
- F. None of above. chosen
Statements (52)
| Predicate | Object |
|---|---|
| instanceOf |
artificial lake
ⓘ
reservoir ⓘ tourist attraction ⓘ |
| constructionStartOfDam | 1956 ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| damCompletionYear | 1963 ⓘ |
| damLocation | Page, Arizona ⓘ |
| formedByDam | Glen Canyon Dam ⓘ |
| fullStorageCapacity |
about 24.3 million acre-feet
ⓘ
about 30 cubic kilometers ⓘ |
| inflows |
Colorado River
ⓘ
Escalante River ⓘ San Juan River ⓘ |
| initialFillingBegan | 1963 ⓘ |
| JohnWesleyPowellNotableFor | exploration of the Colorado River ⓘ |
| JohnWesleyPowellOccupation |
explorer
ⓘ
geologist ⓘ |
| knownFor |
dramatic desert landscapes
ⓘ
red-rock canyon scenery ⓘ slot canyons ⓘ |
| length |
about 186 miles
ⓘ
about 300 kilometers ⓘ |
| locatedIn |
Arizona
ⓘ
Utah ⓘ |
| locatedInRegion |
southwestern United States
ⓘ
surface form:
American Southwest
|
| locatedOnRiver | Colorado River ⓘ |
| managedBy |
National Park Service
ⓘ
surface form:
U.S. National Park Service
|
| maximumDepth |
over 150 meters
ⓘ
over 500 feet ⓘ |
| namedAfter | John Wesley Powell ⓘ |
| nearbyCity | Page, Arizona ⓘ |
| nearbyStateBorder | Arizona–Utah border ⓘ |
| outflow |
Colorado River
ⓘ
surface form:
Colorado River below Glen Canyon Dam
|
| partOf |
Colorado River Storage and Regulation System
ⓘ
surface form:
Colorado River Storage Project
Glen Canyon National Recreation Area ⓘ |
| reachedFullPoolYear | 1980 ⓘ |
| recreationActivity |
boating
ⓘ
camping ⓘ fishing ⓘ houseboating ⓘ kayaking ⓘ water skiing ⓘ |
| reservoirPurpose |
flood control
ⓘ
hydroelectric power generation ⓘ recreation ⓘ water storage ⓘ |
| shorelineLengthAtFullPool |
about 1,960 miles
ⓘ
about 3,150 kilometers ⓘ |
| subjectTo | water level fluctuations due to drought and water use ⓘ |
| surfaceAreaAtFullPool |
about 161,000 acres
ⓘ
about 650 square kilometers ⓘ |
| waterServes | Upper Basin states of the Colorado River Compact ⓘ |
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 Powell Description of subject: Lake Powell is a large, man-made reservoir on the Colorado River known for its striking red-rock canyon scenery and recreational boating in the American Southwest.
Referenced by (23)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Glen Canyon
subject surface form:
Southern Utah
this entity surface form:
Lake Powell marinas
subject surface form:
Northern Arizona
this entity surface form:
Lake Powell (Arizona portion)