Mayfield Dam
E690603
Mayfield Dam is a hydroelectric dam in Washington State that forms Mayfield Lake and generates power on the Cowlitz River.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Mayfield Dam canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T7711986 — 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: Mayfield Dam Context triple: [Cowlitz River, hasHydroelectricDam, Mayfield Dam]
-
A.
McClure Dam
McClure Dam is a hydroelectric dam on the Dead River in Michigan, forming McClure Basin and providing power and water management for the surrounding region.
-
B.
Chatfield Dam
Chatfield Dam is a large flood-control and water-storage structure in Colorado that creates Chatfield Reservoir on the South Platte River near Denver.
-
C.
Goodwin Dam
Goodwin Dam is a concrete gravity diversion dam on California’s Stanislaus River that helps regulate river flow and supplies irrigation water to surrounding agricultural areas.
-
D.
Gillespie Dam
Gillespie Dam is an early 20th-century concrete gravity dam on Arizona’s Gila River, historically used for irrigation and now noted as a local landmark and wildlife habitat area.
-
E.
R. L. Harris Dam
R. L. Harris Dam is a hydroelectric dam in Alabama that impounds the Tallapoosa River to form Lake Wedowee and generate 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: Mayfield Dam Target entity description: Mayfield Dam is a hydroelectric dam in Washington State that forms Mayfield Lake and generates power on the Cowlitz River.
-
A.
McClure Dam
McClure Dam is a hydroelectric dam on the Dead River in Michigan, forming McClure Basin and providing power and water management for the surrounding region.
-
B.
Chatfield Dam
Chatfield Dam is a large flood-control and water-storage structure in Colorado that creates Chatfield Reservoir on the South Platte River near Denver.
-
C.
Goodwin Dam
Goodwin Dam is a concrete gravity diversion dam on California’s Stanislaus River that helps regulate river flow and supplies irrigation water to surrounding agricultural areas.
-
D.
Gillespie Dam
Gillespie Dam is an early 20th-century concrete gravity dam on Arizona’s Gila River, historically used for irrigation and now noted as a local landmark and wildlife habitat area.
-
E.
R. L. Harris Dam
R. L. Harris Dam is a hydroelectric dam in Alabama that impounds the Tallapoosa River to form Lake Wedowee and generate power.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
gravity dam
ⓘ
hydroelectric dam ⓘ |
| alsoKnownAs | Mayfield Hydroelectric Dam NERFINISHED ⓘ |
| basinCountry |
United States of America
ⓘ
surface form:
United States
|
| commissioningDate | 1963 ⓘ |
| connectedInfrastructure | State Route 12 bridge over Mayfield Lake NERFINISHED ⓘ |
| constructionBegan | 1955 ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| createsWaterBody | Mayfield Lake NERFINISHED ⓘ |
| energySource | hydropower ⓘ |
| formsReservoir | Mayfield Lake NERFINISHED ⓘ |
| gridConnection | regional power grid in western Washington ⓘ |
| hasRecreationArea | Mayfield Lake Park NERFINISHED ⓘ |
| hasSpillway | yes ⓘ |
| height | approximately 250 feet ⓘ |
| impounds | Cowlitz River NERFINISHED ⓘ |
| length | approximately 850 feet ⓘ |
| locatedDownstreamOf | Mossyrock Dam NERFINISHED ⓘ |
| locatedIn | Lewis County, Washington NERFINISHED ⓘ |
| locatedNear |
Mossyrock, Washington
NERFINISHED
ⓘ
Silver Creek, Washington NERFINISHED ⓘ |
| locatedOnRiver | Cowlitz River NERFINISHED ⓘ |
| locatedUpstreamOf | Cowlitz Falls Dam NERFINISHED ⓘ |
| managingOrganization | Tacoma Public Utilities NERFINISHED ⓘ |
| nearCity |
Mossyrock
NERFINISHED
ⓘ
Silver Creek NERFINISHED ⓘ |
| numberOfTurbines | 4 ⓘ |
| openingDate | 1963 ⓘ |
| operatedBy | Tacoma Power NERFINISHED ⓘ |
| ownedBy | Tacoma Power NERFINISHED ⓘ |
| partOf | Cowlitz River Project NERFINISHED ⓘ |
| plantCapacity | approximately 162 MW ⓘ |
| purpose |
flood control
ⓘ
hydroelectric power generation ⓘ recreation ⓘ |
| region | Pacific Northwest ⓘ |
| regulatesFlowTo | downstream Cowlitz River ⓘ |
| reservoirName | Mayfield Lake NERFINISHED ⓘ |
| reservoirSurfaceElevation | approximately 425 feet above sea level ⓘ |
| reservoirUse |
boating
ⓘ
camping ⓘ fishing ⓘ |
| spillwayType | gated overflow ⓘ |
| state | Washington ⓘ |
| turbineType | Francis turbine ⓘ |
| watercourse | Cowlitz 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: Mayfield Dam Description of subject: Mayfield Dam is a hydroelectric dam in Washington State that forms Mayfield Lake and generates power on the Cowlitz River.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.