Glen Canyon Dam
E155459
Glen Canyon Dam is a massive concrete arch-gravity dam on the Colorado River in northern Arizona that created Lake Powell and plays a major role in water storage and hydroelectric power generation in the American Southwest.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Glen Canyon Dam canonical | 11 |
| Carl Hayden Dam | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T1258903 — 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: Glen Canyon Dam Context triple: [Bureau of Reclamation, notableProject, Glen Canyon Dam]
-
A.
Davis Dam
Davis Dam is a concrete gravity-arch dam on the Colorado River between Nevada and Arizona that forms Lake Mohave and helps regulate water releases from Hoover Dam.
-
B.
Hoover Dam
Hoover Dam is a massive concrete arch-gravity dam on the Colorado River, renowned as a landmark feat of 20th-century American engineering and a major source of hydroelectric power and water management in the Southwest.
-
C.
Bonneville Dam
Bonneville Dam is a major hydroelectric and navigation dam on the Columbia River in the Pacific Northwest, known for power generation, fish ladders, and its role in regional river management.
-
D.
Red Rock Dam
Red Rock Dam is a large flood-control and hydroelectric dam on the Des Moines River in central Iowa, forming Lake Red Rock as the state’s largest reservoir.
-
E.
Grand Coulee Dam
Grand Coulee Dam is a massive concrete gravity dam on the Columbia River in Washington State, renowned as one of the largest power-producing facilities in the United States and a landmark of New Deal–era infrastructure.
- 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: Glen Canyon Dam Target entity description: Glen Canyon Dam is a massive concrete arch-gravity dam on the Colorado River in northern Arizona that created Lake Powell and plays a major role in water storage and hydroelectric power generation in the American Southwest.
-
A.
Davis Dam
Davis Dam is a concrete gravity-arch dam on the Colorado River between Nevada and Arizona that forms Lake Mohave and helps regulate water releases from Hoover Dam.
-
B.
Hoover Dam
Hoover Dam is a massive concrete arch-gravity dam on the Colorado River, renowned as a landmark feat of 20th-century American engineering and a major source of hydroelectric power and water management in the Southwest.
-
C.
Bonneville Dam
Bonneville Dam is a major hydroelectric and navigation dam on the Columbia River in the Pacific Northwest, known for power generation, fish ladders, and its role in regional river management.
-
D.
Red Rock Dam
Red Rock Dam is a large flood-control and hydroelectric dam on the Des Moines River in central Iowa, forming Lake Red Rock as the state’s largest reservoir.
-
E.
Grand Coulee Dam
Grand Coulee Dam is a massive concrete gravity dam on the Columbia River in Washington State, renowned as one of the largest power-producing facilities in the United States and a landmark of New Deal–era infrastructure.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
arch-gravity dam
ⓘ
concrete dam ⓘ hydroelectric power station ⓘ |
| associatedWith |
Lake Powell
ⓘ
Page, Arizona ⓘ |
| basinCountry |
United States of America
ⓘ
surface form:
United States
|
| constructionEndDate | 1966-09-13 ⓘ |
| constructionStartDate | 1956-10-15 ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| createdReservoir | Lake Powell ⓘ |
| crosses | Colorado River ⓘ |
| damVolume |
3,700,000 m³
ⓘ
4,900,000 yd³ ⓘ |
| energySource | hydropower ⓘ |
| height |
216 m
ⓘ
710 ft ⓘ |
| impact |
inundated most of Glen Canyon
ⓘ
significantly altered Colorado River flow regime ⓘ |
| length |
1,560 ft
ⓘ
475 m ⓘ |
| locatedIn |
Arizona
ⓘ
Glen Canyon ⓘ |
| locatedInRegion | northern Arizona ⓘ |
| locatedOnRiver | Colorado River ⓘ |
| managedBy |
United States Department of the Interior
ⓘ
surface form:
U.S. Department of the Interior
|
| mapFeature | major infrastructure of the American Southwest ⓘ |
| material | concrete ⓘ |
| namedAfter | Glen Canyon ⓘ |
| nearestCity | Page, Arizona ⓘ |
| openingDate | 1966-09-13 ⓘ |
| operator |
Bureau of Reclamation
ⓘ
surface form:
United States Bureau of Reclamation
|
| ownedBy |
Bureau of Reclamation
ⓘ
surface form:
United States Bureau of Reclamation
|
| partOf |
Colorado River Storage and Regulation System
ⓘ
surface form:
Colorado River Storage Project
|
| plantCapacity | 1,320 MW ⓘ |
| plantTurbines | 8 ⓘ |
| plantType | conventional hydroelectric ⓘ |
| purpose |
flood control
ⓘ
hydroelectric power generation ⓘ recreation support ⓘ river regulation ⓘ water storage ⓘ |
| regionServed |
southwestern United States
ⓘ
surface form:
American Southwest
|
| reservoirName | Lake Powell ⓘ |
| reservoirSurfaceArea |
252 sq mi
ⓘ
653 km² ⓘ |
| reservoirTotalCapacity |
27,000,000 acre⋅ft
ⓘ
33,320,000,000 m³ ⓘ |
| spillwayType | gated concrete tunnel spillways ⓘ |
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: Glen Canyon Dam Description of subject: Glen Canyon Dam is a massive concrete arch-gravity dam on the Colorado River in northern Arizona that created Lake Powell and plays a major role in water storage and hydroelectric power generation in the American Southwest.
Referenced by (12)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Carl Hayden Dam