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Interstate Bridge (Approach Span)

Interstate Bridge (Approach Span)

Primary Photographer(s): Sharon Mollerus, CC BY 2.0, https://www.flickr.com/photos/clairity/

Bridge Documented: 2020

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Key Facts

Facility Carried / Feature Intersected
Pedestrian Walkway Over St. Louis River
Location
Duluth: St. Louis County, Minnesota and Douglas County, Wisconsin: United States
Construction Date and Builder / Engineer
1897 By Builder/Contractor: Pennsylvania Steel Company of Steelton, Pennsylvania and Engineer/Design: Alfred P. Boller of Philadelphia, Pennsylvania

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
325 Feet (99 Meters)
Structure Length
845 Feet (258 Meters)
Roadway Width
Not Available
Spans
1 Main Span(s)
NBI Number
Not Applicable

Historic Significance Rating (HSR)

Bridge Documentation

Originally a large swing bridge over the river, today only one of the fixed approach truss spans remain today. The bridge was built in 1897. As originally designed it had a 485 foot swing span (one of the longest swing spans in the country) and was flanked by one 325 foot through truss approach span at each end of the swing span. Only after a few years of operation, in 1906, the bridge was hit by the steamer Troy of the Western Transit Line, at 1am, August 11. The swing span was replaced by a new swing span, which appears to have been nearly identical to the 1897 span, including decorative finials and pedimented portal bracing. The bridge was designed to carry a combination of railroad and highway traffic, with highway traffic using a cantilevered deck. Highway traffic ceased on the bridge i n 1961 when the nearby high level Blatnik Bridge was completed. Photos showing the construction of the Blatnik Bridge appear to show that by this time, one of the fixed through truss approach spans on this bridge had been replaced by a timber trestle structure. The bridge was closed and the swing span left open in 1962. In the 1970s, the swing span was demolished, leaving the other fixed through truss span the only surviving truss span of the bridge. In the 1990s, a unique fishing pier deck was hung from the underside of this bridge, so the span has found new life in this adaptive reuse. Note: Dimensions and structure details given above refer to the bridge structure as seen today, not as originally built. As originally built, the bridge length was 1,920 feet.

Above: Historical photo showing bridge with all three truss spans.

Above: Historical photo showing swing span collapse.

Above: Historical photo showing swing span collapse.

Above: Photo showing the bridge when the Blatnik Bridge was being built. Note how one of the fixed Parker truss spans has been replaced.

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Photo Galleries and Videos: Interstate Bridge (Approach Span)

 
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Bridge Photo-Documentation
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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: Interstate Bridge (Approach Span)

Coordinates (Latitude, Longitude):
46.750568,-92.100446

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