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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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and Videos
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Key Facts

Facility Carried / Feature Intersected
I-535 and US-53 Over St. Louis Bay
Location
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
2013
Main Span Length
600 Feet (183 Meters)
Structure Length
7,985 Feet (2,434 Meters)
Roadway Width
58 Feet (17.68 Meters)
Spans
3 Main Span(s) and 49 Approach Span(s)
NBI Number
9030

Historic Significance Rating (HSR)

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.

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

Above: Historical photo showing bridge construction.

Above: Historical photo showing bridge construction.

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Photo Galleries and Videos: Blatnik Bridge

 
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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
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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

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Maps and Links: Blatnik Bridge

Coordinates (Latitude, Longitude):
46.749274,-92.100994

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