Jamestown Dam
E895793
Jamestown Dam is an earthfill dam in North Dakota that creates Jamestown Reservoir for flood control, irrigation, and recreation on the James River.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Jamestown Dam canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T10305963 — 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: Jamestown Dam Context triple: [James River, hasDam, Jamestown Dam]
-
A.
West Point Dam
West Point Dam is a large U.S. Army Corps of Engineers hydroelectric and flood-control dam on the Chattahoochee River, forming West Point Lake on the Alabama–Georgia border.
-
B.
Jennings Randolph Dam
Jennings Randolph Dam is a large earthen flood-control and water-supply dam on the North Branch Potomac River along the Maryland–West Virginia border in the United States.
-
C.
Leesville Dam
Leesville Dam is a hydroelectric and flood-control structure on the Roanoke River in Virginia that creates Leesville Lake.
-
D.
Forestville Dam
Forestville Dam is a hydroelectric and recreational dam located on the Dead River near Marquette in Michigan’s Upper Peninsula.
-
E.
Monticello Dam
Monticello Dam is a large concrete arch dam in Napa County, California, that creates Lake Berryessa and provides water storage, flood control, and hydroelectric power.
- 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: Jamestown Dam Target entity description: Jamestown Dam is an earthfill dam in North Dakota that creates Jamestown Reservoir for flood control, irrigation, and recreation on the James River.
-
A.
West Point Dam
West Point Dam is a large U.S. Army Corps of Engineers hydroelectric and flood-control dam on the Chattahoochee River, forming West Point Lake on the Alabama–Georgia border.
-
B.
Jennings Randolph Dam
Jennings Randolph Dam is a large earthen flood-control and water-supply dam on the North Branch Potomac River along the Maryland–West Virginia border in the United States.
-
C.
Leesville Dam
Leesville Dam is a hydroelectric and flood-control structure on the Roanoke River in Virginia that creates Leesville Lake.
-
D.
Forestville Dam
Forestville Dam is a hydroelectric and recreational dam located on the Dead River near Marquette in Michigan’s Upper Peninsula.
-
E.
Monticello Dam
Monticello Dam is a large concrete arch dam in Napa County, California, that creates Lake Berryessa and provides water storage, flood control, and hydroelectric power.
- F. None of above. chosen
Statements (43)
| Predicate | Object |
|---|---|
| instanceOf |
earthfill dam
ⓘ
embankment dam ⓘ |
| constructionBegan | 1952 ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| county | Stutsman County, North Dakota NERFINISHED ⓘ |
| createsReservoir | Jamestown Reservoir NERFINISHED ⓘ |
| crestElevation | approximately 1465 feet above mean sea level ⓘ |
| damType | zoned earthfill ⓘ |
| hasFeature |
concrete spillway
ⓘ
earthen embankment ⓘ outlet works ⓘ |
| hasFunction | regulation of James River flows ⓘ |
| hasUse |
irrigation
ⓘ
recreation ⓘ |
| height | approximately 85 feet ⓘ |
| length | approximately 1418 feet ⓘ |
| locatedIn | North Dakota NERFINISHED ⓘ |
| locatedNear | Jamestown, North Dakota NERFINISHED ⓘ |
| locatedOnRiver | James River NERFINISHED ⓘ |
| managingAgency | United States Bureau of Reclamation NERFINISHED ⓘ |
| nearCity | Jamestown, North Dakota NERFINISHED ⓘ |
| openingYear | 1953 ⓘ |
| operator | United States Bureau of Reclamation NERFINISHED ⓘ |
| owner | United States Bureau of Reclamation NERFINISHED ⓘ |
| partOf | Missouri River basin NERFINISHED ⓘ |
| partOfProject | Pick–Sloan Missouri Basin Program NERFINISHED ⓘ |
| primaryPurpose | flood control ⓘ |
| purpose |
reduction of downstream flood damage
ⓘ
support of recreational activities on Jamestown Reservoir ⓘ water supply for irrigation ⓘ |
| region | central North Dakota ⓘ |
| reservoirName | Jamestown Reservoir NERFINISHED ⓘ |
| reservoirPurpose |
flood control
ⓘ
irrigation storage ⓘ recreation ⓘ |
| reservoirRecreation |
boating
ⓘ
camping ⓘ fishing ⓘ swimming ⓘ |
| riverBasin | James River basin NERFINISHED ⓘ |
| spillwayType | concrete chute spillway ⓘ |
| state | North Dakota NERFINISHED ⓘ |
| watercourseDammed | James River 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: Jamestown Dam Description of subject: Jamestown Dam is an earthfill dam in North Dakota that creates Jamestown Reservoir for flood control, irrigation, and recreation on the James River.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.