Hoover Dam
E6243
National Historic Landmark
arch-gravity dam
civil engineering landmark
concrete dam
hydroelectric power station
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.
All labels observed (7)
How this entity was disambiguated
This entity first appeared as the object of triple T48258 — 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: Hoover Dam Context triple: [Public Works Administration, notableProject, Hoover Dam]
-
A.
Nevada Fall
Nevada Fall is a prominent and picturesque waterfall on the Merced River in Yosemite National Park, known for its powerful drop and dramatic granite surroundings.
-
B.
South Lake Tahoe
South Lake Tahoe is a resort city in California known for its access to Lake Tahoe’s beaches, ski resorts, and outdoor recreation.
-
C.
Vernal Fall
Vernal Fall is a prominent and picturesque waterfall on the Merced River in Yosemite National Park, renowned for its powerful flow and popular hiking access via the Mist Trail.
-
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.
Erie Canal
The Erie Canal is a historic man-made waterway in New York State that opened in 1825, linking the Great Lakes to the Atlantic Ocean and transforming U.S. commerce and westward expansion.
- 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: Hoover Dam Target entity description: 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.
-
A.
Nevada Fall
Nevada Fall is a prominent and picturesque waterfall on the Merced River in Yosemite National Park, known for its powerful drop and dramatic granite surroundings.
-
B.
South Lake Tahoe
South Lake Tahoe is a resort city in California known for its access to Lake Tahoe’s beaches, ski resorts, and outdoor recreation.
-
C.
Vernal Fall
Vernal Fall is a prominent and picturesque waterfall on the Merced River in Yosemite National Park, renowned for its powerful flow and popular hiking access via the Mist Trail.
-
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.
Erie Canal
The Erie Canal is a historic man-made waterway in New York State that opened in 1825, linking the Great Lakes to the Atlantic Ocean and transforming U.S. commerce and westward expansion.
- F. None of above. chosen
Statements (59)
| Predicate | Object |
|---|---|
| instanceOf |
National Historic Landmark
ⓘ
arch-gravity dam ⓘ civil engineering landmark ⓘ concrete dam ⓘ hydroelectric power station ⓘ |
| annualGeneration | about 4 TWh to 5 TWh ⓘ |
| baseWidth | 660 ft ⓘ |
| borderBetween | Nevada and Arizona ⓘ |
| bypassBridge | Mike O’Callaghan–Pat Tillman Memorial Bridge ⓘ |
| constructionEndDate | 1936 ⓘ |
| constructionMethod | concrete block placement with cooling pipes ⓘ |
| constructionStartDate | 1931 ⓘ |
| coordinates | 36.0156°N 114.7378°W ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| crestWidth | 45 ft ⓘ |
| crosses | Black Canyon ⓘ |
| engineeringSignificance | major feat of 20th-century American engineering ⓘ |
| formerName |
Hoover Dam
self-linksurface differs
ⓘ
surface form:
Boulder Dam
|
| fundedBy |
United States government
ⓘ
surface form:
U.S. federal government
|
| height |
221 m
ⓘ
726 ft ⓘ |
| heritageDesignation |
National Historic Landmark
ⓘ
National Register of Historic Places ⓘ
surface form:
National Register of Historic Places listing
|
| installedCapacity | about 2,080 MW ⓘ |
| length |
1244 ft
ⓘ
379 m ⓘ |
| locatedIn |
Arizona
ⓘ
Nevada ⓘ |
| locatedInRegion |
southwestern United States
ⓘ
surface form:
Southwestern United States
|
| locatedOnRiver | Colorado River ⓘ |
| namedAfter | Herbert Hoover ⓘ |
| nearCity |
Boulder City, Nevada
ⓘ
Las Vegas, Nevada ⓘ |
| numberOfTurbines | 17 ⓘ |
| officialName | Hoover Dam self-link ⓘ |
| openingDate | 1936 ⓘ |
| operator |
Bureau of Reclamation
ⓘ
surface form:
United States Bureau of Reclamation
|
| owner |
Bureau of Reclamation
ⓘ
surface form:
United States Bureau of Reclamation
|
| partOf |
Hoover Dam
self-linksurface differs
ⓘ
surface form:
Boulder Canyon Project
|
| plantCommissioned | 1936 ⓘ |
| primaryPurpose |
flood control
ⓘ
hydroelectric power generation ⓘ irrigation water supply ⓘ municipal water supply ⓘ navigation improvement ⓘ |
| recognizedAs |
National Historic Civil Engineering Landmark
ⓘ
surface form:
American Society of Civil Engineers Historic Civil Engineering Landmark
|
| reservoir | Lake Mead ⓘ |
| reservoirCapacity | about 28.9 million acre-feet ⓘ |
| roadwayCarries | U.S. Route 93 (historically) ⓘ |
| suppliesPowerTo |
Arizona
ⓘ
California, United States ⓘ
surface form:
California
Nevada ⓘ |
| touristAttraction | yes ⓘ |
| turbineType | Francis turbine ⓘ |
| visitorsPerYear | about 7 million ⓘ |
| volumeOfDam | about 3,250,000 cubic yards of concrete ⓘ |
| waterManagementRole |
provides municipal water to Southwestern cities
ⓘ
regulates Colorado River flows ⓘ supports irrigation in the American Southwest ⓘ |
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: Hoover Dam Description of subject: 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.
Referenced by (45)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
Public Works Administration
subject surface form:
Arizona
this entity surface form:
Hoover Dam (Arizona side)
this entity surface form:
Boulder Dam
this entity surface form:
Boulder Canyon Project
subject surface form:
Public Works Administration
this entity surface form:
Hoover Dam crossing of the Colorado River
this entity surface form:
Hoover Dam (Arizona side vicinity)
subject surface form:
Boulder Canyon Project
subject surface form:
Boulder Canyon Project
this entity surface form:
Hoover Dam (via Bechtel’s role in Six Companies, Inc.)
subject surface form:
Southern Nevada
subject surface form:
Southern Nevada