Yellowtail Dam
E170016
Yellowtail Dam is a large concrete arch-gravity dam on the Bighorn River in Montana, United States, primarily used for hydroelectric power generation, irrigation, and flood control.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Yellowtail Dam canonical | 3 |
How this entity was disambiguated
This entity first appeared as the object of triple T1258920 — 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: Yellowtail Dam Context triple: [Bureau of Reclamation, hasDams, Yellowtail Dam]
-
A.
Wheeler Dam
Wheeler Dam is a hydroelectric dam on the Tennessee River in northern Alabama that forms Wheeler Lake and helps provide power, navigation, and flood control in the region.
-
B.
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.
-
C.
Parker Dam
Parker Dam is a concrete arch-gravity dam on the Colorado River best known for creating Lake Havasu and supplying water and hydroelectric power to parts of California and Arizona.
-
D.
O'Shaughnessy Dam
O'Shaughnessy Dam is a concrete arch-gravity dam in Yosemite National Park that creates the Hetch Hetchy Reservoir, supplying water and hydroelectric power to the San Francisco Bay Area.
-
E.
Prosser Creek Dam
Prosser Creek Dam is an earthfill dam in Nevada County, California, that creates Prosser Creek Reservoir for water storage, flood control, and recreation in the Truckee River basin.
- 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: Yellowtail Dam Target entity description: Yellowtail Dam is a large concrete arch-gravity dam on the Bighorn River in Montana, United States, primarily used for hydroelectric power generation, irrigation, and flood control.
-
A.
Wheeler Dam
Wheeler Dam is a hydroelectric dam on the Tennessee River in northern Alabama that forms Wheeler Lake and helps provide power, navigation, and flood control in the region.
-
B.
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.
-
C.
Parker Dam
Parker Dam is a concrete arch-gravity dam on the Colorado River best known for creating Lake Havasu and supplying water and hydroelectric power to parts of California and Arizona.
-
D.
O'Shaughnessy Dam
O'Shaughnessy Dam is a concrete arch-gravity dam in Yosemite National Park that creates the Hetch Hetchy Reservoir, supplying water and hydroelectric power to the San Francisco Bay Area.
-
E.
Prosser Creek Dam
Prosser Creek Dam is an earthfill dam in Nevada County, California, that creates Prosser Creek Reservoir for water storage, flood control, and recreation in the Truckee River basin.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
arch-gravity dam
ⓘ
concrete dam ⓘ hydroelectric dam ⓘ |
| basinCountry |
United States of America
ⓘ
surface form:
United States
|
| constructionBegan | 1961 ⓘ |
| constructionCompleted | 1967 ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| createsReservoir | Bighorn Lake ⓘ |
| crestElevation | 3,657 ft above sea level ⓘ |
| crosses | Bighorn River ⓘ |
| damVolume |
1,150,000 m³
ⓘ
1,500,000 cubic yards ⓘ |
| height |
160 m
ⓘ
525 ft ⓘ |
| length |
1,480 ft
ⓘ
451 m ⓘ |
| locatedIn | Montana ⓘ |
| locatedInCounty | Big Horn County, Montana ⓘ |
| locatedOnRiver | Bighorn River ⓘ |
| locatedWithin |
Bighorn Canyon
ⓘ
surface form:
Bighorn Canyon National Recreation Area
|
| managesWaterFor | irrigation projects in the Bighorn River basin ⓘ |
| material | concrete ⓘ |
| namedAfter | Robert Yellowtail ⓘ |
| nearSettlement | Fort Smith, Montana ⓘ |
| numberOfTurbines | 4 ⓘ |
| openingYear | 1967 ⓘ |
| operator |
Bureau of Reclamation
ⓘ
surface form:
U.S. Bureau of Reclamation
|
| ownedBy |
Bureau of Reclamation
ⓘ
surface form:
United States Bureau of Reclamation
|
| partOf |
Pick-Sloan Missouri Basin Program
ⓘ
surface form:
Pick–Sloan Missouri Basin Program
|
| plantCapacity | 250 MW ⓘ |
| plantCommissioned | 1966 ⓘ |
| provides |
flood protection for downstream communities
ⓘ
recreation opportunities on Bighorn Lake ⓘ |
| purpose |
flood control
ⓘ
hydroelectric power generation ⓘ irrigation ⓘ |
| region |
Great Plains
ⓘ
surface form:
Northern Great Plains
|
| reservoirCapacityTotal |
1,380,000 acre-feet
ⓘ
1.70 km³ ⓘ |
| reservoirExtendsInto | Wyoming ⓘ |
| reservoirName | Bighorn Lake ⓘ |
| reservoirSurfaceArea |
17,300 acres
ⓘ
70 km² ⓘ |
| riverSystem |
Missouri River Basin
ⓘ
surface form:
Missouri River basin
|
| spillwayCapacity |
2,780 m³/s
ⓘ
98,000 cu ft/s ⓘ |
| spillwayType | gated overflow spillway ⓘ |
| turbineType | Francis turbine ⓘ |
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: Yellowtail Dam Description of subject: Yellowtail Dam is a large concrete arch-gravity dam on the Bighorn River in Montana, United States, primarily used for hydroelectric power generation, irrigation, and flood control.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.