Elwha Dam
E790140
Elwha Dam was a large hydroelectric dam on Washington State’s Elwha River, best known for its removal as part of one of the largest river restoration and dam removal projects in U.S. history.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Elwha Dam canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T8958873 — 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: Elwha Dam Context triple: [Elwha River, hadDam, Elwha Dam]
-
A.
Wanapum Dam
Wanapum Dam is a hydroelectric dam on the Columbia River in Washington State that generates power, supports irrigation, and helps regulate river flow.
-
B.
Hells Canyon Dam
Hells Canyon Dam is a hydroelectric concrete arch-gravity dam on the Snake River in the Hells Canyon region along the Oregon–Idaho border in the United States.
-
C.
Dworshak Dam
Dworshak Dam is a large concrete gravity dam on the North Fork Clearwater River in Idaho, primarily used for hydroelectric power generation, flood control, and recreation.
-
D.
Coulee Dam, Washington
Coulee Dam, Washington is a small town in north-central Washington State best known as the community adjacent to the massive Grand Coulee Dam on the Columbia River.
-
E.
The Dalles Dam
The Dalles Dam is a large hydroelectric dam and navigation facility on the Columbia River in the Pacific Northwest, known for its significant power generation and impact on regional river ecosystems and communities.
- 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: Elwha Dam Target entity description: Elwha Dam was a large hydroelectric dam on Washington State’s Elwha River, best known for its removal as part of one of the largest river restoration and dam removal projects in U.S. history.
-
A.
Wanapum Dam
Wanapum Dam is a hydroelectric dam on the Columbia River in Washington State that generates power, supports irrigation, and helps regulate river flow.
-
B.
Hells Canyon Dam
Hells Canyon Dam is a hydroelectric concrete arch-gravity dam on the Snake River in the Hells Canyon region along the Oregon–Idaho border in the United States.
-
C.
Dworshak Dam
Dworshak Dam is a large concrete gravity dam on the North Fork Clearwater River in Idaho, primarily used for hydroelectric power generation, flood control, and recreation.
-
D.
Coulee Dam, Washington
Coulee Dam, Washington is a small town in north-central Washington State best known as the community adjacent to the massive Grand Coulee Dam on the Columbia River.
-
E.
The Dalles Dam
The Dalles Dam is a large hydroelectric dam and navigation facility on the Columbia River in the Pacific Northwest, known for its significant power generation and impact on regional river ecosystems and communities.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
former dam
ⓘ
hydroelectric dam ⓘ |
| adjacentTo | Olympic National Park NERFINISHED ⓘ |
| completionDate | 1913 ⓘ |
| constructionStartDate | 1910 ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| createdReservoir | Lake Aldwell NERFINISHED ⓘ |
| decommissioningStartDate | 2011 ⓘ |
| demolitionDate | 2012 ⓘ |
| environmentalImpact |
blocked salmon migration
ⓘ
reduced sediment transport to Elwha River delta ⓘ |
| followedBy | Elwha River Restoration Project NERFINISHED ⓘ |
| hasCoordinateRegion | northwestern Washington State ⓘ |
| height |
108 feet
ⓘ
32 meters ⓘ |
| historicalEra | early 20th century industrial development ⓘ |
| impactOfRemoval |
expansion of estuarine and coastal habitats
ⓘ
reestablishment of natural sediment flow ⓘ restoration of fish passage on Elwha River ⓘ |
| legalBasisForRemoval | Elwha River Ecosystem and Fisheries Restoration Act NERFINISHED ⓘ |
| length |
150 meters
ⓘ
492 feet ⓘ |
| locatedIn |
Clallam County, Washington
NERFINISHED
ⓘ
Olympic Peninsula NERFINISHED ⓘ Washington ⓘ
surface form:
Washington State
|
| locatedNear | Port Angeles, Washington NERFINISHED ⓘ |
| locatedOnRiver | Elwha River NERFINISHED ⓘ |
| locatedWithin | Elwha River watershed NERFINISHED ⓘ |
| notableFor |
being one of the largest dam removal projects in U.S. history
ⓘ
role in river restoration and salmon recovery ⓘ |
| openingDate | 1913 ⓘ |
| operator | U.S. Bureau of Reclamation NERFINISHED ⓘ |
| originalOperator | Northwest Power and Light Company NERFINISHED ⓘ |
| ownedBy |
U.S. Bureau of Reclamation
NERFINISHED
ⓘ
U.S. federal government NERFINISHED ⓘ |
| partOf | Elwha River dams NERFINISHED ⓘ |
| precededBy | unimpounded Elwha River ⓘ |
| purpose |
hydroelectric power generation
ⓘ
industrial power supply ⓘ |
| region | Pacific Northwest ⓘ |
| removalEndDate | 2014 ⓘ |
| removalStartDate | 2011 ⓘ |
| removedAsPartOf |
Elwha River Ecosystem and Fisheries Restoration Act implementation
ⓘ
Elwha River Restoration Project NERFINISHED ⓘ |
| riverImpounded | Elwha River NERFINISHED ⓘ |
| status |
demolished
ⓘ
removed ⓘ |
| usedFor | powering timber and paper mills in Port Angeles ⓘ |
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: Elwha Dam Description of subject: Elwha Dam was a large hydroelectric dam on Washington State’s Elwha River, best known for its removal as part of one of the largest river restoration and dam removal projects in U.S. history.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.