Occoquan Dam
E592219
Occoquan Dam is a concrete gravity dam in northern Virginia that creates the Occoquan Reservoir, a major regional water supply and flood-control structure for the Washington, D.C. metropolitan area.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Occoquan Dam canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T6257904 — 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: Occoquan Dam Context triple: [Occoquan River, hasDam, Occoquan Dam]
-
A.
Delaware Dam
Delaware Dam is a flood-control and water-management structure located on the Olentangy River in central Ohio.
-
B.
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.
-
C.
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.
-
D.
Holyoke Dam
Holyoke Dam is a historic hydroelectric dam on the Connecticut River in Holyoke, Massachusetts, known for powering the city’s early industrial development.
-
E.
Occoquan Reservoir
Occoquan Reservoir is a man-made lake in Northern Virginia that serves as a major drinking water source and recreational area for the Washington, D.C. metropolitan region.
- 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: Occoquan Dam Target entity description: Occoquan Dam is a concrete gravity dam in northern Virginia that creates the Occoquan Reservoir, a major regional water supply and flood-control structure for the Washington, D.C. metropolitan area.
-
A.
Delaware Dam
Delaware Dam is a flood-control and water-management structure located on the Olentangy River in central Ohio.
-
B.
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.
-
C.
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.
-
D.
Holyoke Dam
Holyoke Dam is a historic hydroelectric dam on the Connecticut River in Holyoke, Massachusetts, known for powering the city’s early industrial development.
-
E.
Occoquan Reservoir
Occoquan Reservoir is a man-made lake in Northern Virginia that serves as a major drinking water source and recreational area for the Washington, D.C. metropolitan region.
- F. None of above. chosen
Statements (45)
| Predicate | Object |
|---|---|
| instanceOf |
concrete gravity dam
ⓘ
dam ⓘ reservoir ⓘ |
| basinCountry |
United States of America
ⓘ
surface form:
United States
|
| category |
Buildings and structures in Fairfax County, Virginia
ⓘ
Dams in Virginia ⓘ Gravity dams ⓘ Reservoirs in Virginia ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| createsReservoir | Occoquan Reservoir NERFINISHED ⓘ |
| crosses | Occoquan River NERFINISHED ⓘ |
| damType | gravity dam ⓘ |
| function |
flow regulation
ⓘ
regional drinking water source ⓘ |
| hasReservoir | Occoquan Reservoir NERFINISHED ⓘ |
| impounds | Occoquan River NERFINISHED ⓘ |
| locatedIn |
Fairfax County, Virginia
ⓘ
Northern Virginia ⓘ Northern Virginia ⓘ |
| locatedNear |
Occoquan Regional Park
NERFINISHED
ⓘ
Town of Occoquan NERFINISHED ⓘ |
| locatedOn |
Occoquan River
NERFINISHED
ⓘ
Occoquan River NERFINISHED ⓘ |
| material | concrete ⓘ |
| nearCity |
Occoquan, Virginia
NERFINISHED
ⓘ
Woodbridge, Virginia NERFINISHED ⓘ |
| operator |
Fairfax Water
NERFINISHED
ⓘ
Fairfax Water NERFINISHED ⓘ |
| ownedBy | Fairfax Water NERFINISHED ⓘ |
| partOf |
Occoquan Reservoir water supply system
NERFINISHED
ⓘ
Potomac River watershed NERFINISHED ⓘ Potomac River watershed NERFINISHED ⓘ |
| purpose |
flood control
ⓘ
water supply ⓘ |
| regionServed |
Northern Virginia
ⓘ
Washington, D.C. metropolitan area NERFINISHED ⓘ |
| riverSystem | Potomac River system NERFINISHED ⓘ |
| serves | Washington, D.C. metropolitan area NERFINISHED ⓘ |
| state | Virginia ⓘ |
| usedFor |
drinking water supply
ⓘ
drought protection ⓘ flood mitigation ⓘ municipal water supply ⓘ recreation ⓘ |
| watercourse | Occoquan 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: Occoquan Dam Description of subject: Occoquan Dam is a concrete gravity dam in northern Virginia that creates the Occoquan Reservoir, a major regional water supply and flood-control structure for the Washington, D.C. metropolitan area.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.