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Mid Fork Zumbro River Bridge

Photo 

Oronoco

The banks of the Zumbro River are spanned by a bridge at Oronoco. This bridge, built about 1876, was the second bridge at this location and was later replaced by a concrete bridge in 1918

Olmsted County Historical Society

BH Photo #177618

Map 

Description 

Any help with the truss description would be very helpful i have never seen a truss like this anywhere

Facts 

Overview
Truss bridge over Mid Fork Zumbro River on CR 18 in Oronoco
Location
Olmsted County, Minnesota
Status
Replaced by new bridge
History
Built 1876; Replaced 1917
Design
3-hinged braced arch-truss
Approximate latitude, longitude
+44.16222, -92.53472   (decimal degrees)
44°09'44" N, 92°32'05" W   (degrees°minutes'seconds")
Approximate UTM coordinates
15/537201/4889995 (zone/easting/northing)
Quadrangle map:
Oronoco
Average daily traffic (as of 2014)
2,350
Inventory numbers
MN 448 (Minnesota bridge number)
BH 20523 (Bridgehunter.com ID)
Inspection report (as of October 2018)
Overall condition: Fair
Superstructure condition rating: Satisfactory (6 out of 9)
Substructure condition rating: Satisfactory (6 out of 9)
Deck condition rating: Good (7 out of 9)
Sufficiency rating: 96.5 (out of 100)
View more at BridgeReports.com

Update Log 

  • November 24, 2021: Updated by Luke: Added builders and reverted type to what Paul edited it to. It's definitely NOT a pony truss.
  • November 24, 2021: Updated by Paul Plassman: Added bridge type based on a suggestion from Luke about a similar bridge
  • September 15, 2010: New photo from Benjamin Cole

Sources 

  • Benjamin Cole - mountainjam99 [at] gmail [dot] com
  • Paul Plassman
  • Luke

Comments 

Mid Fork Zumbro River Bridge
Posted November 24, 2021, by Luke

Upon further looking, it's definitely the same design, and the same designer designed both, per the builder plaque matching.

The portals on this bridge are different, and match a bridge that was purportedly built by the Chicago Bridge Co. https://bridgehunter.com/mn/fillmore/bh71677/

It should definitely be merged with https://bridgehunter.com/mn/olmsted/bh71603/

Mid Fork Zumbro River Bridge
Posted November 24, 2021, by Paul Plassman

Is there any way to "de-link" this page to the NBI data? Somebody linked it to the BridgeReports page for the 1918 replacement concrete arch bridge and as a result a lot of the data in the bottom half of the page applies to the 1918 span, not this bridge.

Mid Fork Zumbro River Bridge
Posted November 24, 2021, by Paul Plassman

Thanks, Luke! This bridge looks very similar to the one you pointed out.

Mid Fork Zumbro River Bridge
Posted November 24, 2021, by Luke

Reminds be of the bridge at Clermont, Iowa. https://bridgehunter.com/ia/fayette/bh57344/

Referred to as a "3-hinged braced arch-truss"

Mid Fork Zumbro River Bridge
Posted November 24, 2021, by Paul Plassman

Same photo as above but you can zoom in on it: https://collection.mndigital.org/catalog/olms:705#/image/0

I'm not 100% sure on this but I believe this is the same bridge as https://bridgehunter.com/mn/olmsted/bh71603/.

Also what type of bridge would this be considered anyway? Some kind of cantilever/arch combination perhaps?

Mid Fork Zumbro River Bridge
Posted September 16, 2010, by Benjamin Cole (mountainjam99 [at] gmail [dot] com)

website with plenty of historic photos

http://reflections.mndigital.org/index.php

Mid Fork Zumbro River Bridge
Posted September 16, 2010, by Nate Ahrensfeld

Where did you find that picture?