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Jackknife Bascule Bridge

Jackknife Bascule Bridge

Primary Photographer(s): C. Hanchey, CC BY-NC 2.0, flickr.com/photos/21953562@N07/

Bridge Documented: August 6, 2017

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Key Facts

Facility Carried / Feature Intersected
Railroad (Canadian Pacific) and Former Highway Over Kaministiquia River
Location
Thunder Bay: Thunder Bay District, Ontario: Canada
Structure Type
Metal Rivet-Connected Warren Through Truss, Movable: Single Leaf Bascule (Heel Trunnion) and Approach Spans: Metal ,
Construction Date and Builder / Engineer
1914 By Builder/Contractor: Alexander Charles Stewart and Engineer/Design: Strauss Bascule Bridge Company (Strauss Engineering Company) of Chicago, Illinois

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
186 Feet (57 Meters)
Structure Length
374 Feet (114 Meters)
Roadway Width
29 Feet (8.84 Meters)
Spans
1 Main Span(s)
NBI Number
Not Applicable

Historic Significance Rating (HSR)

Bridge Documentation

One of the most unique surviving Strauss bascule bridges in North America, this bridge originally had a highway deck over its railway deck. Today, the highway deck and related approach ramp structures have been removed, a demolition project dating to 2004 after the Island Drive Bridge was built. But the bascule bridge itself remains intact. Due to its heavy weight due to the double-deck configuration, this bridge has unusually massive concrete counterweights. Strauss claimed this was the first double-deck bascule bridge in the world when completed. The contractor for the abutments and piers was Alexander Charles Stewart. This bridge is listed on the City of Thunder Bay Heritage Register.

Above: Historical photo.

Above: Historical ca. 1913 photo showing newly completed bridge partially raised. Note people standing on bridge!

Above: Historical 1970 photo showing both decks in place. Photo Credit Weston Langford, CC BY-ND 4.0 https://www.westonlangford.com/images/photo/110535/

Above: Historical 1970 photo showing both decks in place. Photo Credit Weston Langford, CC BY-ND 4.0 https://www.westonlangford.com/images/photo/110536/   

Above: Historical photo showing bridge in raised position.

Above: Historical postcard showing both decks in place.

 


This bridge is tagged with the following special condition(s): Double-Deck

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Photo Galleries and Videos: Jackknife Bascule Bridge

 
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A collection of overview and detail photos. This gallery features data-friendly, fast-loading photos in a touch-friendly popup viewer. Alternatively, Browse Without Using Viewer

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Maps and Links: Jackknife Bascule Bridge

Coordinates (Latitude, Longitude):
48.372533,-89.249016

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