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Blatnik Bridge

John A. Blatnik Bridge, High Bridge

Blatnik Bridge

Primary Photographer(s): Aquatic Sciences Center, CC BY-NC 2.0, https://www.flickr.com/photos/uwiscseagrant/

Bridge Documented: 2020

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Key Facts

Facility Carried / Feature Intersected
I-535 and US-53 Over St. Louis Bay
Duluth: St. Louis County, Minnesota and Douglas County, Wisconsin: United States
Structure Type
Metal Cantilever (Arch and Suspended Deck) 20 Panel Rivet-Connected Warren Through Truss, Fixed and Approach Spans: Metal Deck Girder, Fixed
Construction Date and Builder / Engineer
1961 By Builder/Contractor: American Bridge Company of New York, New York and Engineer/Design: Howard, Needles, Tammen and Bergendorff of Kansas City, Missouri

Technical Facts

Rehabilitation Date
Main Span Length
600 Feet (182.9 Meters)
Structure Length
7,985 Feet (2433.8 Meters)
Roadway Width
58 Feet (17.68 Meters)
3 Main Span(s) and 49 Approach Span(s)
NBI Number

Historic Significance Rating (HSR)
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Bridge Documentation

This bridge's future is at risk!

Bridge Status: Slated for demolition and replacement!

This bridge is a rare example of a cantilever truss bridge that features a tied arch suspended span. Large hinges can be seen where the bridge design changes from truss to arch over the waterway some distance from the piers. The truss cantilever arms extend for 60 feet (two panels) inward over the navigation span. The remaining 16 panels are the 480 foot tied arch suspended span. Anchor spans are 270 feet each.

American Bridge Company was just one of a large number of contractors who were involved with the construction of this large bridge. A historical pamphlet shown below lists all the involved contractors. Within the list are many large bridge contractors.

View Archived National Bridge Inventory Report - Has Additional Details and Evaluation

Above: Historical photo showing bridge construction.

Above: Historical photo showing bridge construction.

Above: Historical literature showing the builders of the bridge.


Photo Galleries and Videos: Blatnik Bridge

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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: Blatnik Bridge

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