10 votes

Redstone Bridge


Redstone Bridge

Photo taken by John Marvig in January 2013


BH Photo #247365



Built as the original mainline of the CNW between New Ulm and Mankato. Used as a alternate route after the present DME line was built.

Line currently only serves a rock quarry. It ends just east of the quarry. It was abandoned from the quarry to St. Peter in 1971.


Through truss bridge over Minnesota River on DM&E Railroad Spur
Redstone, Brown County, Minnesota, and Nicollet County, Minnesota
Open to traffic
Built 1880, still the original structure piers stablized recently
- Leighton Bridge & Iron Works of Rochester, New York (Approach Spans)
- Rust & Coolidge of Chicago, Illinois (Swing Span)
- Canadian Pacific Railway (CP)
- Chicago & North Western Railway (CNW)
- Dakota, Minnesota, & Eastern Railroad (DME)
- Iowa, Chicago & Eastern Railroad (ICE)
410' of timber trestle
1-130' Quadrangular lattice through truss
1-206' Through truss swing span
1-130' Quadrangular lattice through truss
Length of largest span: 206.0 ft.
Total length: 880.0 ft.
Also called
CN&W Bridge #432
Approximate latitude, longitude
+44.28551, -94.41487   (decimal degrees)
44°17'08" N, 94°24'54" W   (degrees°minutes'seconds")
Approximate UTM coordinates
15/387108/4904558 (zone/easting/northing)
Quadrangle map:
New Ulm
Inventory number
BH 49404 (Bridgehunter.com ID)

Update Log 

  • November 14, 2021: Updated by John Marvig: added builder for swing span
  • March 2, 2017: Updated by Christopher Finigan: Added categories "Pin-connected", "Riveted"
  • June 12, 2015: New photos from John Marvig
  • August 22, 2013: New photo from Douglas Butler
  • January 26, 2013: New photo from John Marvig
  • January 20, 2013: Updated by John Marvig: Added builder
  • August 10, 2012: Updated by John Marvig: Added categories "Minnesota River", "railroad"
  • September 9, 2011: New photos from John Marvig
  • August 23, 2011: Added by John Marvig


Redstone Bridge
Posted November 14, 2021, by John Marvig (marvigj27 [at] gmail [dot] com)

I made a somewhat shocking discovery yesterday when I discovered that this swing span was built by Rust & Coolidge of Chicago. It appears that Leighton was only responsible for the approach trusses, which may indicate why a lattice pattern was not used for the swing span.

Redstone Bridge
Posted September 5, 2015, by Jason Smith (flensburg [dot] bridgehunter [dot] av [at] googlemail [dot] com)

More information in this and other bridges in New Ulm you'll find here: http://thebridgehunter.areavoices.com/2015/09/05/the-bridges...

DM&E Redstone Bridge
Posted November 27, 2011, by John Marvig (johnmarvig [at] chaska [dot] net)

Yes, its a shame that this bridge was encased like that.

I got to the west end by a walk over the bridge, which was a little frightening.

DM&E Redstone Bridge
Posted November 19, 2011, by Tony Dillon (spansaver [at] hotmail [dot] com)

Indeed...a very nice set of photos!

It's a shame they didn't tuck-point the beautiful cut stone instead of encasing it in concrete.

DM&E Redstone Bridge
Posted November 19, 2011, by Clark Vance (cvance [at] dogmail [dot] com)

The John Marvig photo set below is a very good collection and worth a look.

DM&E Redstone Bridge
Posted November 18, 2011, by John Marvig (johnmarvig [at] chaska [dot] net)
DM&E Redstone Bridge
Posted November 14, 2011, by Jake (simpspin [at] yahoo [dot] com)

For more info, check out this link:


DM&E Redstone Bridge
Posted November 12, 2011, by John Marvig (johnmarvig [at] chaska [dot] net)

Yes, this is a really cool bridge. If it is ever abandoned, it should and likley will become a trail. I think it should be on the National Register of Historic Places.

There is no way this bridge isn't 1880. The new line was built 1899, and if this bridge needed to be replaced, the line would have just been abandoned. Also, this bridge does appear to be in excellent condition, and did not look to be welded shut upon closer inspection from me on 11-12-11. It had bolts, but those could easily be removed, with some sort of tool.

DM&E Redstone Bridge
Posted October 24, 2011, by Nathan Holth (form3 [at] historicbridges [dot] org)

No one has really commented on this bridge but if the swing span really was built in 1880 (and based on its unique details I don't doubt it) than this is one of the most historically and technologically significant railroad bridges in the country. It is only a year newer than one of the oldest highway swing bridges in the country: http://www.historicbridges.org/truss/57th/