Copco Dam No. 1
E405781
Copco Dam No. 1 is a hydroelectric dam on the Klamath River in northern California, historically used for power generation and now central to regional river restoration and dam removal efforts.
All labels observed (4)
| Label | Occurrences |
|---|---|
| Copco 1 Dam | 1 |
| Copco Dam No. 1 canonical | 1 |
| Copco Dam No. 2 | 1 |
| Copco No. 1 Dam | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T4015915 — 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: Copco Dam No. 1 Context triple: [Klamath River, hasDam, Copco Dam No. 1]
-
A.
La Mesa Dam
La Mesa Dam is a major water reservoir in Quezon City, Philippines, that supplies a significant portion of Metro Manila’s drinking water.
-
B.
San Carlos Dam
San Carlos Dam is a major concrete gravity dam in Arizona that creates San Carlos Lake and provides irrigation water, flood control, and hydroelectric power along the Gila River.
-
C.
Stanislaus Afterbay Dam
Stanislaus Afterbay Dam is a water-control structure on California’s Stanislaus River that forms an afterbay used for regulating river flows and supporting irrigation and hydropower operations.
-
D.
Colbún Dam
Colbún Dam is a major hydroelectric dam in Chile that generates power from the Maule River and plays a key role in the country’s energy supply.
-
E.
Coolidge Dam
Coolidge Dam is a large concrete multiple-arch dam in Arizona that impounds the Gila River to form San Carlos Lake for irrigation, flood control, and water storage.
- 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: Copco Dam No. 1 Target entity description: Copco Dam No. 1 is a hydroelectric dam on the Klamath River in northern California, historically used for power generation and now central to regional river restoration and dam removal efforts.
-
A.
La Mesa Dam
La Mesa Dam is a major water reservoir in Quezon City, Philippines, that supplies a significant portion of Metro Manila’s drinking water.
-
B.
San Carlos Dam
San Carlos Dam is a major concrete gravity dam in Arizona that creates San Carlos Lake and provides irrigation water, flood control, and hydroelectric power along the Gila River.
-
C.
Stanislaus Afterbay Dam
Stanislaus Afterbay Dam is a water-control structure on California’s Stanislaus River that forms an afterbay used for regulating river flows and supporting irrigation and hydropower operations.
-
D.
Colbún Dam
Colbún Dam is a major hydroelectric dam in Chile that generates power from the Maule River and plays a key role in the country’s energy supply.
-
E.
Coolidge Dam
Coolidge Dam is a large concrete multiple-arch dam in Arizona that impounds the Gila River to form San Carlos Lake for irrigation, flood control, and water storage.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
gravity dam
ⓘ
hydroelectric dam ⓘ |
| affects | fish migration on the Klamath River ⓘ |
| associatedWith |
Klamath people
ⓘ
surface form:
Klamath Basin tribes
Klamath Hydroelectric Settlement Agreement ⓘ environmental organizations ⓘ |
| builtFor |
PacifiCorp
ⓘ
surface form:
California Oregon Power Company
|
| connectedTo | Copco No. 1 Powerhouse ⓘ |
| constructionBegan | 1910 ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| createsReservoir | Copco Lake NERFINISHED ⓘ |
| damType | concrete gravity arch ⓘ |
| designedBy | John S. Eastwood ⓘ |
| hasAlternativeName |
Copco Dam No. 1
ⓘ
surface form:
Copco 1 Dam
Copco Dam No. 1 ⓘ
surface form:
Copco No. 1 Dam
|
| hasEnvironmentalImpact |
affects water temperature
ⓘ
alters river flow regime ⓘ blocks anadromous fish passage ⓘ |
| hasPurpose |
hydroelectric power generation
ⓘ
water storage ⓘ |
| hasSpillway | yes ⓘ |
| hasTurbineType | Francis turbines ⓘ |
| height | approximately 126 feet ⓘ |
| historicalSignificance | early 20th-century hydroelectric development on the Klamath River ⓘ |
| impounds | Klamath River ⓘ |
| installedCapacity | about 20 MW ⓘ |
| length | approximately 415 feet ⓘ |
| locatedIn |
Northern California
ⓘ
Siskiyou County, California NERFINISHED ⓘ |
| locatedOnRiver | Klamath River ⓘ |
| nearSettlement |
Copco, California
ⓘ
Yreka, California ⓘ |
| opened | 1918 ⓘ |
| operator | PacifiCorp ⓘ |
| ownedBy | PacifiCorp ⓘ |
| partOf |
Klamath River Hydroelectric Project
ⓘ
Klamath River dam removal and restoration effort ⓘ |
| regulatoryAuthority | Federal Energy Regulatory Commission ⓘ |
| removalPartOf | largest dam removal project in U.S. history ⓘ |
| spillwayType | overflow spillway ⓘ |
| status | planned for removal ⓘ |
| structureMaterial | concrete ⓘ |
| subjectOf |
FERC relicensing proceedings
ⓘ
Klamath River restoration projects ⓘ environmental impact assessments ⓘ |
| usedFor |
grid peaking and base-load support
ⓘ
regional electricity supply ⓘ |
| watershed |
Klamath Basin
ⓘ
surface form:
Klamath River Basin
|
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: Copco Dam No. 1 Description of subject: Copco Dam No. 1 is a hydroelectric dam on the Klamath River in northern California, historically used for power generation and now central to regional river restoration and dam removal efforts.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Copco Dam No. 2
this entity surface form:
Copco No. 1 Dam
this entity surface form:
Copco 1 Dam