Mossyrock Dam
E690659
Mossyrock Dam is a large hydroelectric concrete arch-gravity dam in Washington State, known for being the tallest dam in the state and a major source of power and flood control on the Cowlitz River.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Mossyrock Dam canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T7711987 — 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: Mossyrock Dam Context triple: [Cowlitz River, hasHydroelectricDam, Mossyrock Dam]
-
A.
Howden Dam
Howden Dam is a large masonry dam in Derbyshire, England, forming part of the Upper Derwent Valley reservoir system and known for its impressive architecture and role in regional water supply.
-
B.
Fengman Dam
Fengman Dam is a large hydroelectric gravity dam on the Songhua River in Jilin Province, China, known for its significant role in regional power generation and flood control.
-
C.
Merwin Dam
Merwin Dam is a hydroelectric dam on Washington State’s Lewis River that forms Lake Merwin and generates power for the region.
-
D.
Stewart Mountain Dam
Stewart Mountain Dam is a concrete thin-arch dam on Arizona’s Salt River that forms Saguaro Lake and provides water storage, hydroelectric power, and recreation.
-
E.
Moose Creek Dam
Moose Creek Dam is a major flood-control structure on Alaska’s Chena River that protects the city of Fairbanks and surrounding areas from seasonal flooding.
- 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: Mossyrock Dam Target entity description: Mossyrock Dam is a large hydroelectric concrete arch-gravity dam in Washington State, known for being the tallest dam in the state and a major source of power and flood control on the Cowlitz River.
-
A.
Howden Dam
Howden Dam is a large masonry dam in Derbyshire, England, forming part of the Upper Derwent Valley reservoir system and known for its impressive architecture and role in regional water supply.
-
B.
Fengman Dam
Fengman Dam is a large hydroelectric gravity dam on the Songhua River in Jilin Province, China, known for its significant role in regional power generation and flood control.
-
C.
Merwin Dam
Merwin Dam is a hydroelectric dam on Washington State’s Lewis River that forms Lake Merwin and generates power for the region.
-
D.
Stewart Mountain Dam
Stewart Mountain Dam is a concrete thin-arch dam on Arizona’s Salt River that forms Saguaro Lake and provides water storage, hydroelectric power, and recreation.
-
E.
Moose Creek Dam
Moose Creek Dam is a major flood-control structure on Alaska’s Chena River that protects the city of Fairbanks and surrounding areas from seasonal flooding.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
arch-gravity dam
ⓘ
concrete dam ⓘ hydroelectric dam ⓘ |
| associatedWith | hydropower generation in western Washington ⓘ |
| basinCountry |
United States of America
ⓘ
surface form:
United States
|
| constructionBegan | 1961 ⓘ |
| constructionMaterial | concrete ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| createsReservoir | Riffe Lake NERFINISHED ⓘ |
| damCrosses | Cowlitz River NERFINISHED ⓘ |
| energySource | hydropower ⓘ |
| function | peak flow regulation on the Cowlitz River ⓘ |
| hasRecreation |
boating on Riffe Lake
ⓘ
camping around Riffe Lake ⓘ fishing on Riffe Lake ⓘ |
| height |
about 185 meters
ⓘ
about 606 feet ⓘ |
| installedCapacity | about 300 MW ⓘ |
| isTallestDamIn | Washington State NERFINISHED ⓘ |
| length |
about 1,648 feet
ⓘ
about 502 meters ⓘ |
| locatedIn |
Lewis County, Washington
NERFINISHED
ⓘ
Washington ⓘ
surface form:
Washington State
|
| nearCity | Mossyrock, Washington NERFINISHED ⓘ |
| notableFor |
being the tallest dam in Washington State
ⓘ
large hydroelectric capacity on the Cowlitz River ⓘ major role in regional flood control ⓘ |
| numberOfTurbines | 2 ⓘ |
| openingDate | 1968 ⓘ |
| operator | Tacoma Power NERFINISHED ⓘ |
| owner | Tacoma Power NERFINISHED ⓘ |
| partOf | Cowlitz River Project NERFINISHED ⓘ |
| primaryUse | base-load power supply for Tacoma Power system ⓘ |
| purpose |
flood control
ⓘ
hydroelectric power generation ⓘ recreation ⓘ water storage ⓘ |
| region | Pacific Northwest ⓘ |
| reservoirFormerName | Mossyrock Lake NERFINISHED ⓘ |
| reservoirName | Riffe Lake NERFINISHED ⓘ |
| river | Cowlitz River NERFINISHED ⓘ |
| spillwayType | gated overflow spillway ⓘ |
| status | operational ⓘ |
| turbineType | Francis turbine ⓘ |
| typeOfStructure | arch-gravity concrete structure ⓘ |
| 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: Mossyrock Dam Description of subject: Mossyrock Dam is a large hydroelectric concrete arch-gravity dam in Washington State, known for being the tallest dam in the state and a major source of power and flood control on the Cowlitz River.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.