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Interstate Bridge


Overall view of truss structure

These photos were taken with an i-phone and are not the best--also, access is only possible from the pier underneath, and as such, detail shots of the truss are very limited.

Photo taken by Matthew Lohry in March 2011


BH Photo #195467


Street View 


Lost Duluth II

Video of Duluth's lost landmarks; Discussion of this bridge begins at 4:48. Includes scenes of collision/destruction of bridge, which was then rebuilt.


Play video on YouTube


This enormous and impressive pin-connected Parker through truss span is all that remains of the bridge that once carried a railroad and U.S. Hwy. 53 across the Duluth Harbor/St. Louis River. It once had an identical Parker truss span at the southern end and a very long and massive swing span joining them together. This bridge was replaced by the Blatnik Bridge, which itself is very beautiful and, being built in 1961, has almost itself achieved historic status. Most of the bridge was demolished in the '70's to make way for ship traffic, but this truss span and most of the northern approach were left in place and abandonded for several decades until being converted to a fishing pier sometime within the last decade. The new pier is suspended from the flooring system of the remaining Parker truss span and ends at the pier supporting the truss span. Access from shore is done with a ramp that runs through the original timber bents that supported the railroad (the inner verticals were removed). This is a very innovative and creative way to allow up-close viewing of this historic and impressive bridge.


Parker through truss bridge over St. Louis River on Fishing pier (former railroad, US 53)
Duluth, St. Louis County, Minnesota, and Douglas County, Wisconsin
Open to pedestrians
Built 1897; Swing span struck and replaced 1906; replaced by Blatnik Bridge 1961, all but northern span removed 1970's
- Alfred P. Boller of Philadelphia, Pennsylvania
- Pennsylvania Steel Co. of Steelton, Pennsylvania
- Burlington Northern Railroad (BN)
- Duluth-Superior Transit Co. (DST)
- Great Northern Railway (GN)
Parker through truss
Length of largest span: 485.0 ft.
Total length: 1,920.0 ft.
Also called
St. Louis River Bridge
Approximate latitude, longitude
+46.75048, -92.10042   (decimal degrees)
46°45'02" N, 92°06'02" W   (degrees°minutes'seconds")
Approximate UTM coordinates
15/568708/5177829 (zone/easting/northing)
Quadrangle map:
Inventory number
BH 48443 (Bridgehunter.com ID)

Update Log 

  • September 27, 2020: New photos from Ed Hollowell
  • October 16, 2019: New photos from Ben Tate
  • May 19, 2017: New photo from Dana and Kay Klein
  • September 11, 2016: Updated by Luke: Noted the cause for swing span replacement
  • September 8, 2016: New photo from Dave King
  • January 28, 2015: New photo from Luke
  • July 21, 2014: New Street View added by Ralph Demars
  • July 21, 2014: New video from Don Morrison
  • February 10, 2014: New photo from Douglas Butler
  • February 9, 2014: New photos from John Marvig
  • February 8, 2014: Updated by John Marvig: Added information
  • August 10, 2012: Updated by John Marvig: Added categories "Rail-to-trail", "railroad"
  • March 19, 2011: Added by Matthew Lohry

Related Bridges 


  • Matt Lohry
  • John Marvig - marvigj27 [at] gmail [dot] com
  • Douglas Butler
  • Don Morrison
  • Luke
  • Dave King - DKinghawkfan [at] hotmail [dot] com
  • Dana and Kay Klein
  • Ben Tate - benji5221 [at] yahoo [dot] com
  • Ed Hollowell - erhollowell [at] aol [dot] com


Interstate Bridge
Posted October 16, 2019, by CHAD ROBERSON (mrtazwrench [at] juno [dot] com)