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McKenzie Bridge

Photo 

McKenzie Bridge

1950s view

Photo from old postcard

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BH Photo #513199

Description 

The McKenzie River Bridge at McKenzie Bridge was a very unique structure that was designed by the Oregon State Highway Department under State Bridge Engineer Conde B. McCullough.

The bridge featured one of a kind details such as the 100-foot long concrete encased steel pony truss that is shaped to appear as an elegant concrete arch bridge. The 100-foot main truss was suspended between two 15-foot long reinforced concrete cantilevered arched arms giving the main span a total length of 130-feet.

The approach spans consisted of 50-foot long reinforced concrete girders with the exterior girders arched to seamlessly blend with the arched main span.

The bridge featured a a 24-foot wide roadway and 4-foot wide sidewalks along each side protected by a standard OSHD baluster railing that is still seen on many of Oregon's remaining concrete bridges from the era.

The bridge was built in 1929 and was replaced with a pre-stressed concrete box girder bridge in 1968.

Facts 

Overview
Lost Concrete encased pony truss bridge over McKenzie River on OR-126 McKenzie Highway
Location
Lane County, Oregon
Status
Replaced by a new bridge
History
Built 1929. Replaced 1968
Builder
- Conde B. McCullough of Redfield, South Dakota
Design
Parker pony truss encased in concrete.
Dimensions
Length of largest span: 130.0 ft.
Total length: 230.0 ft.
Deck width: 24.0 ft.
Approximate latitude, longitude
+44.17408, -122.16137   (decimal degrees)
44°10'27" N, 122°09'41" W   (degrees°minutes'seconds")
Approximate UTM coordinates
10/567039/4891549 (zone/easting/northing)
Elevation
1343 ft. above sea level
Inventory number
BH 95414 (Bridgehunter.com ID)

Update Log 

  • June 6, 2022: Updated by Mike Goff: Added category "Conde B. McCullough", added description.
  • December 9, 2021: New photo from Geoff Hubbs

Sources 

  • Geoff Hubbs

Comments 

McKenzie Bridge
Posted January 16, 2022, by Mike Goff (michael [dot] goff [at] hotmail [dot] com)

I'll see if I can dig anything up about the design features of this bridge. It appears to be a concrete encased arch/truss of some sort. It has Oregon's standard rail for that time so there may be something in the records. Great photo find Geoff!

McKenzie Bridge
Posted December 9, 2021, by Nathan Holth (webmaster [at] historicbridges [dot] org)

Goeff: Wow, this is a great find! Note the diagonal members... extremely rare with bridges of this type. Compare this this: https://historicbridges.org/bridges/browser/?bridgebrowser=p...