Portage Lake Lift Bridge
E291025
The Portage Lake Lift Bridge is a prominent vertical-lift bridge in Michigan’s Upper Peninsula that connects the cities of Houghton and Hancock across the Keweenaw Waterway.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Portage Lake Lift Bridge canonical | 7 |
| Portage Canal Lift Bridge | 1 |
| Portage Lake swing bridge | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T2595440 — 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: Portage Lake Lift Bridge Context triple: [Houghton County, Michigan, hasMajorBridge, Portage Lake Lift Bridge]
-
A.
Sault Ste. Marie Canal Swing Bridge
The Sault Ste. Marie Canal Swing Bridge is a historic movable bridge in Sault Ste. Marie, Ontario, that carries road and rail traffic across the canal near the St. Marys River.
-
B.
Algonquin Bridge
Algonquin Bridge is a pedestrian bridge located on the Toronto Islands, providing a scenic crossing between parts of the island park system.
-
C.
Whirlpool Rapids Bridge
Whirlpool Rapids Bridge is a historic steel arch bridge connecting Niagara Falls, New York, and Niagara Falls, Ontario, spanning the Niagara Gorge just downstream from the famous falls.
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D.
Mackinac Bridge
The Mackinac Bridge is a major suspension bridge in Michigan that connects the state's Upper and Lower Peninsulas and is one of the longest suspension bridges in the world.
-
E.
Nipigon River Bridge
Nipigon River Bridge is a cable-stayed bridge in Ontario, Canada, notable for carrying the Trans-Canada Highway across the Nipigon River and serving as a key transportation link in northern Ontario.
- 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: Portage Lake Lift Bridge Target entity description: The Portage Lake Lift Bridge is a prominent vertical-lift bridge in Michigan’s Upper Peninsula that connects the cities of Houghton and Hancock across the Keweenaw Waterway.
-
A.
Sault Ste. Marie Canal Swing Bridge
The Sault Ste. Marie Canal Swing Bridge is a historic movable bridge in Sault Ste. Marie, Ontario, that carries road and rail traffic across the canal near the St. Marys River.
-
B.
Algonquin Bridge
Algonquin Bridge is a pedestrian bridge located on the Toronto Islands, providing a scenic crossing between parts of the island park system.
-
C.
Whirlpool Rapids Bridge
Whirlpool Rapids Bridge is a historic steel arch bridge connecting Niagara Falls, New York, and Niagara Falls, Ontario, spanning the Niagara Gorge just downstream from the famous falls.
-
D.
Mackinac Bridge
The Mackinac Bridge is a major suspension bridge in Michigan that connects the state's Upper and Lower Peninsulas and is one of the longest suspension bridges in the world.
-
E.
Nipigon River Bridge
Nipigon River Bridge is a cable-stayed bridge in Ontario, Canada, notable for carrying the Trans-Canada Highway across the Nipigon River and serving as a key transportation link in northern Ontario.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
movable bridge
ⓘ
road bridge ⓘ vertical-lift bridge ⓘ |
| alsoKnownAs |
Houghton–Hancock Bridge
ⓘ
Portage Lake Lift Bridge ⓘ
surface form:
Portage Canal Lift Bridge
|
| carries |
motor vehicles
ⓘ
pedestrians ⓘ |
| clearanceBelowWhenLowered | about 35 feet ⓘ |
| clearanceBelowWhenRaised | about 100 feet ⓘ |
| connects |
Hancock, Michigan
NERFINISHED
ⓘ
Houghton, Michigan ⓘ |
| constructionStartDate | 1957 ⓘ |
| country | United States of America ⓘ |
| crosses | Keweenaw Waterway ⓘ |
| crossesAt | Portage Canal ⓘ |
| designedBy | Hazelet & Erdal ⓘ |
| hasDecks | two ⓘ |
| hasHeritageStatus | eligible for listing on the National Register of Historic Places ⓘ |
| hasLiftSpan | yes ⓘ |
| hasMainSpanLength | about 325 feet ⓘ |
| hasNumberOfSpans | 3 ⓘ |
| hasTotalLength | about 1,310 feet ⓘ |
| isLandmarkOf |
Hancock, Michigan
NERFINISHED
ⓘ
Houghton, Michigan ⓘ Upper Peninsula of Michigan ⓘ
surface form:
Michigan’s Upper Peninsula
|
| locatedIn |
Michigan
ⓘ
United States of America ⓘ
surface form:
United States
|
| locatedInAdministrativeEntity |
Houghton County, Michigan
NERFINISHED
ⓘ
Keweenaw County, Michigan NERFINISHED ⓘ |
| lowerDeckUsedFor |
originally rail traffic
ⓘ
snowmobile traffic in winter ⓘ |
| maintainedBy | Michigan Department of Transportation ⓘ |
| materialUsed | steel ⓘ |
| notableFor | being one of the heaviest and widest double-deck vertical-lift bridges in the world ⓘ |
| officialName | Portage Lake Lift Bridge self-link ⓘ |
| opened | 1959 ⓘ |
| over |
Keweenaw Waterway
ⓘ
surface form:
Keweenaw Waterway shipping canal
Portage Lake ⓘ |
| partOf |
M-26 (Michigan highway)
ⓘ
U.S. Route 41 NERFINISHED ⓘ |
| regionServed | Keweenaw Peninsula ⓘ |
| replaced |
Portage Lake Lift Bridge
self-linksurface differs
ⓘ
surface form:
Portage Lake swing bridge
|
| significance | primary land connection to northern Keweenaw Peninsula ⓘ |
| state |
Michigan (most of state)
ⓘ
surface form:
Michigan
|
| upperDeckUsedFor | vehicular traffic ⓘ |
| usedBy |
local traffic between Houghton and Hancock
ⓘ
tourist traffic to Keweenaw Peninsula ⓘ |
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: Portage Lake Lift Bridge Description of subject: The Portage Lake Lift Bridge is a prominent vertical-lift bridge in Michigan’s Upper Peninsula that connects the cities of Houghton and Hancock across the Keweenaw Waterway.
Referenced by (9)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Portage Canal Lift Bridge
this entity surface form:
Portage Lake swing bridge