HistoricBridges.org Menu: HistoricBridges.org Menu:

We Recommend These Resources:
Bach Steel - Experts at historic truss bridge restoration.

HistoricBridges.org: Bridge Browser

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

View Photos
and Videos
View Maps
and Links

Key Facts

Facility Carried / Feature Intersected
Railroad (Canadian Pacific) and Former Highway Over Kaministiquia River
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 (56.7 Meters)
Structure Length
374 Feet (114 Meters)
Roadway Width
29 Feet (8.84 Meters)
1 Main Span(s)
NBI Number
Not Applicable

Historic Significance Rating (HSR)
View Information About HSR Ratings

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


Photo Galleries and Videos: Jackknife Bascule Bridge

View Photo Gallery
Bridge Photo-Documentation
Original / Full Size Photos
A collection of overview and detail photos. This gallery offers photos in the highest available resolution and file size in a touch-friendly popup viewer. Alternatively, Browse Without Using Viewer
View Photo Gallery
Bridge Photo-Documentation
Mobile Optimized Photos
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


Maps and Links: Jackknife Bascule Bridge

Coordinates (Latitude, Longitude):

View Bridge Location In:

Google Maps

Google Streetview (If Available)

Bing Maps


Apple Maps (Via DuckDuckGo Search)

Apple Maps (Apple devices only)


HERE We Go Maps

ACME Mapper

Waze Map

Android: Open Location In Your Map or GPS App

Flickr Gallery (Find Nearby Photos)

Wikimedia Commons (Find Nearby Photos)

Directions Via Sygic For Android

Directions Via Sygic For iOS and Android Dolphin Browser

Home Top


About - Contact

© Copyright 2003-2022, HistoricBridges.org. All Rights Reserved. Disclaimer: HistoricBridges.org is a volunteer group of private citizens. HistoricBridges.org is NOT a government agency, does not represent or work with any governmental agencies, nor is it in any way associated with any government agency or any non-profit organization. While we strive for accuracy in our factual content, HistoricBridges.org offers no guarantee of accuracy. Information is provided "as is" without warranty of any kind, either expressed or implied. Information could include technical inaccuracies or errors of omission. Opinions and commentary are the opinions of the respective HistoricBridges.org member who made them and do not necessarily represent the views of anyone else, including any outside photographers whose images may appear on the page in which the commentary appears. HistoricBridges.org does not bear any responsibility for any consequences resulting from the use of this or any other HistoricBridges.org information. Owners and users of bridges have the responsibility of correctly following all applicable laws, rules, and regulations, regardless of any HistoricBridges.org information.

Admin Login