John Martin Dam
E727203
John Martin Dam is a large flood-control and water-storage structure on the Arkansas River in southeastern Colorado, forming the John Martin Reservoir.
All labels observed (1)
| Label | Occurrences |
|---|---|
| John Martin Dam canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T7911177 — 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: John Martin Dam Context triple: [John Martin Reservoir, hasPart, John Martin Dam]
-
A.
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.
-
B.
Jim Woodruff Dam
Jim Woodruff Dam is a hydroelectric and flood-control dam on the Apalachicola River at the Florida–Georgia border, forming Lake Seminole and helping regulate water flow in the region.
-
C.
McNary Dam
McNary Dam is a large hydroelectric dam and navigation lock complex on the Columbia River in the Pacific Northwest of the United States.
-
D.
Buffalo Bill Dam
Buffalo Bill Dam is a historic concrete arch-gravity dam on the Shoshone River in Wyoming, once one of the tallest in the world and now a key engineering landmark and visitor attraction.
-
E.
Libby Dam
Libby Dam is a large hydroelectric and flood-control dam on the Kootenai River in Montana that contributes significant power and water management capacity to the Columbia 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: John Martin Dam Target entity description: John Martin Dam is a large flood-control and water-storage structure on the Arkansas River in southeastern Colorado, forming the John Martin Reservoir.
-
A.
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.
-
B.
Jim Woodruff Dam
Jim Woodruff Dam is a hydroelectric and flood-control dam on the Apalachicola River at the Florida–Georgia border, forming Lake Seminole and helping regulate water flow in the region.
-
C.
McNary Dam
McNary Dam is a large hydroelectric dam and navigation lock complex on the Columbia River in the Pacific Northwest of the United States.
-
D.
Buffalo Bill Dam
Buffalo Bill Dam is a historic concrete arch-gravity dam on the Shoshone River in Wyoming, once one of the tallest in the world and now a key engineering landmark and visitor attraction.
-
E.
Libby Dam
Libby Dam is a large hydroelectric and flood-control dam on the Kootenai River in Montana that contributes significant power and water management capacity to the Columbia River Basin.
- F. None of above. chosen
Statements (39)
| Predicate | Object |
|---|---|
| instanceOf |
concrete dam
ⓘ
dam ⓘ flood control structure ⓘ |
| alsoKnownAs | Caddoa Dam ⓘ |
| basin |
Arkansas River Basin
ⓘ
linked to:
Arkansas River basin
|
| completedIn | 1948 ⓘ |
| constructionBegan | 1939 ⓘ |
| constructionMaterial | concrete ⓘ |
| country |
United States
ⓘ
linked to:
United States of America
|
| forms | John Martin Reservoir ⓘ |
| governingAgency |
U.S. Army Corps of Engineers Tulsa District
ⓘ
linked to:
Tulsa District, U.S. Army Corps of Engineers
|
| hasFunction |
low-flow augmentation downstream
ⓘ
sediment control ⓘ |
| height | about 118 feet ⓘ |
| length |
about 13,450 feet
ⓘ
about 2.6 miles ⓘ |
| locatedIn |
Colorado
ⓘ
southeastern Colorado ⓘ |
| locatedInCounty | Bent County, Colorado ⓘ |
| locatedNear | Las Animas, Colorado ⓘ |
| locatedOnRiver | Arkansas River ⓘ |
| locatedUpstreamOf | Kansas border on the Arkansas River ⓘ |
| managesFloodRiskFor | communities along the Arkansas River in Colorado ⓘ |
| managesWaterFor | downstream irrigation districts in Colorado ⓘ |
| namedAfter | John A. Martin ⓘ |
| namedAfterOccupation | U.S. Representative from Colorado ⓘ |
| opened | 1948 ⓘ |
| operator |
United States Army Corps of Engineers
ⓘ
linked to:
U.S. Army Corps of Engineers
|
| owner | United States government ⓘ |
| partOf |
Arkansas River water management system
ⓘ
linked to:
Fryingpan–Arkansas Project
|
| providesRecreationAt | John Martin Reservoir State Park ⓘ |
| purpose |
flood control
ⓘ
irrigation water supply ⓘ recreation support ⓘ water storage ⓘ |
| region | southeastern Colorado plains ⓘ |
| reservoirCapacity | about 603,500 acre-feet ⓘ |
| reservoirName | John Martin Reservoir ⓘ |
| spillwayType | gated spillway ⓘ |
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: John Martin Dam Description of subject: John Martin Dam is a large flood-control and water-storage structure on the Arkansas River in southeastern Colorado, forming the John Martin Reservoir.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.