Oahe Dam
E449299
Oahe Dam is a large earth-fill dam on the Missouri River in South Dakota, forming Lake Oahe, one of the largest man-made reservoirs in the United States and a major source of hydroelectric power, irrigation, and flood control.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Oahe Dam canonical | 3 |
How this entity was disambiguated
This entity first appeared as the object of triple T4528892 — 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: Oahe Dam Context triple: [Missouri River Basin, hasMajorDam, Oahe Dam]
-
A.
Shiroro Dam
Shiroro Dam is a major hydroelectric power facility on the Kaduna River in Niger State, Nigeria, supplying electricity and supporting water management in the region.
-
B.
Doma Dam
Doma Dam is a reservoir and recreational site in Nasarawa State, Nigeria, known for its scenic views, fishing opportunities, and role in supporting local agriculture and water supply.
-
C.
Guri Dam
Guri Dam is one of the world’s largest hydroelectric dams, located on the Caroní River in Venezuela and a major source of the country’s electricity.
-
D.
Surobi Dam
Surobi Dam is a hydroelectric and irrigation dam located on the Kabul River in eastern Afghanistan.
-
E.
Sutami Dam
Sutami Dam is a major multipurpose dam in East Java, Indonesia, used primarily for hydroelectric power generation, irrigation, and flood control on the Brantas River.
- 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: Oahe Dam Target entity description: Oahe Dam is a large earth-fill dam on the Missouri River in South Dakota, forming Lake Oahe, one of the largest man-made reservoirs in the United States and a major source of hydroelectric power, irrigation, and flood control.
-
A.
Shiroro Dam
Shiroro Dam is a major hydroelectric power facility on the Kaduna River in Niger State, Nigeria, supplying electricity and supporting water management in the region.
-
B.
Doma Dam
Doma Dam is a reservoir and recreational site in Nasarawa State, Nigeria, known for its scenic views, fishing opportunities, and role in supporting local agriculture and water supply.
-
C.
Guri Dam
Guri Dam is one of the world’s largest hydroelectric dams, located on the Caroní River in Venezuela and a major source of the country’s electricity.
-
D.
Surobi Dam
Surobi Dam is a hydroelectric and irrigation dam located on the Kabul River in eastern Afghanistan.
-
E.
Sutami Dam
Sutami Dam is a major multipurpose dam in East Java, Indonesia, used primarily for hydroelectric power generation, irrigation, and flood control on the Brantas River.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
earth-fill dam
ⓘ
hydroelectric dam ⓘ |
| basinCountry |
United States of America
ⓘ
surface form:
United States
|
| constructionBegan | 1948 ⓘ |
| constructionMaterial |
earth
ⓘ
rockfill ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| downstreamFrom | Garrison Dam NERFINISHED ⓘ |
| energySource | hydropower ⓘ |
| formsReservoir | Lake Oahe NERFINISHED ⓘ |
| hasSpillway | yes ⓘ |
| height | about 245 feet ⓘ |
| impact |
flooded portions of Cheyenne River Indian Reservation
ⓘ
flooded portions of Standing Rock Indian Reservation ⓘ |
| installedCapacity | about 786 megawatts ⓘ |
| length | about 9,300 feet ⓘ |
| locatedIn | South Dakota NERFINISHED ⓘ |
| locatedInCounty |
Hughes County, South Dakota
NERFINISHED
ⓘ
Stanley County, South Dakota NERFINISHED ⓘ |
| locatedNear | Pierre, South Dakota NERFINISHED ⓘ |
| locatedOnRiver | Missouri River NERFINISHED ⓘ |
| namedAfter | Oahe Mission NERFINISHED ⓘ |
| numberOfTurbines | 7 ⓘ |
| openingDate | 1962 ⓘ |
| operator | United States Army Corps of Engineers NERFINISHED ⓘ |
| ownedBy | United States government ⓘ |
| partOf | Missouri River Mainstem System NERFINISHED ⓘ |
| partOfProgram | Pick–Sloan Missouri Basin Program NERFINISHED ⓘ |
| providesWaterSupplyTo |
agricultural users
ⓘ
industrial users ⓘ municipal users ⓘ |
| purpose |
flood control
ⓘ
hydroelectric power generation ⓘ irrigation ⓘ navigation support ⓘ recreation ⓘ |
| region | Great Plains NERFINISHED ⓘ |
| reservoirLength | about 231 miles ⓘ |
| reservoirName | Lake Oahe NERFINISHED ⓘ |
| reservoirSurfaceArea | about 370,000 acres ⓘ |
| reservoirTotalCapacity | about 23.5 million acre-feet ⓘ |
| spillwayType | gated overflow ⓘ |
| supportsActivity |
boating
ⓘ
camping ⓘ hunting ⓘ sport fishing ⓘ |
| turbineType | Francis turbine ⓘ |
| upstreamFrom | Big Bend Dam NERFINISHED ⓘ |
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: Oahe Dam Description of subject: Oahe Dam is a large earth-fill dam on the Missouri River in South Dakota, forming Lake Oahe, one of the largest man-made reservoirs in the United States and a major source of hydroelectric power, irrigation, and flood control.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.