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French Creek Road Bridge


French Creek Road Bridge

Photo taken by Michael Goff on March 21, 2010


BH Photo #158674



Subdivided Warren Pony truss bridge over North Fork French Creek on French Creek Road
Siskiyou County, California
Open to traffic
Built 1975
- Bethlehem Steel Co. of Bethlehem, Pennsylvania
Warren Pony truss
Length of largest span: 60.0 ft.
Total length: 61.0 ft.
Deck width: 23.6 ft.
Approximate latitude, longitude
+41.38139, -122.88556   (decimal degrees)
41°22'53" N, 122°53'08" W   (degrees°minutes'seconds")
Approximate UTM coordinates
10/509569/4581102 (zone/easting/northing)
Quadrangle map:
Average daily traffic (as of 2011)
Inventory numbers
CA 2C-130 (California bridge number)
CA 02C-130 (California bridge number)
BH 11570 (Bridgehunter.com ID)
Inspection report (as of August 2017)
Overall condition: Fair
Superstructure condition rating: Fair (5 out of 9)
Substructure condition rating: Fair (5 out of 9)
Deck condition rating: Good (7 out of 9)
Sufficiency rating: 56.9 (out of 100)
View more at BridgeReports.com

Update Log 

  • June 3, 2010: Updated by Craig Philpott: refined design
  • March 22, 2010: New photos from Michael Goff


  • Mike Goff - michael [dot] goff [at] hotmail [dot] com
  • Craig Philpott - craigphilpott63 [at] gmail [dot] com


French Creek Road Bridge
Posted March 24, 2010, by Nathan Holth (form3 [at] historicbridges [dot] org)

On HistoricBridges.org, the general rule I follow is that I select the construction date that applies to the majority of main spans in the superstructure. This policy differs from other websites (including BridgeHunter) which sometimes list the construction date for substructure, approach spans, etc. Good example: Benwood Bridge: I list it with a 1905 construction date, which reflects the date of the main spans, BridgeHunter lists 1870, which applies to the approach spans.



The National Bridge Inventory often does the same sort of thing, listing dates for approach spans, substructure, etc.

In regards to NBI dates, if the NBI date appears to be completely false (Ohio has a serious NBI problem), I do not include it on HistoricBridges.org and I list the construction date unknown. Sometimes, the construction date appears to refer to a relocation or a rehabilitation, so I place the NBI construction date in my slot for rehab date, and mark the construction date unknown.

That's how we do it over at HistoricBridges.org for what its worth.

French Creek Road Bridge and actual bridge age
Posted March 24, 2010, by Craig Philpott (cphilpott [at] puc [dot] edu)

Michael, your answer was perfect since it goes to my deeper question regarding the "actual" age of a bridge. Much of the data on bridgehunter comes from the NBI and if there is no data plate on the bridge and the engineering of the bridge is clearly of a different era from the NBI published date, what are bridgehunters doing with the discrepency? Leaving the NBI year in place, leaving the year field blank on bridgehunter?

Reconditioning, moving, recyling and re-using bridges happens regularly (but not regularly enough) and it seems to me, that the age of the bridge is the year of first construction of the truss, not the reconditioned year.

Curious how others are handling this topic.

French Creek Road Bridge
Posted March 24, 2010, by Michael Goff (michael [dot] goff [at] odot [dot] state [dot] or [dot] us)

I would guess it was relocated as well.

However, the abutments were most likely rebuilt in the past few years. The concrete looked new, and there were form impressions on the weather exposed concrete.

French Creek Road Bridge
Posted March 23, 2010, by Nathan Holth (form3 [at] historicbridges [dot] org)

The bridge shows no sign of major alteration, so I would vote for it having been relocated.

French Creek Road Bridge
Posted March 23, 2010, by Michael Goff (michael [dot] goff [at] odot [dot] state [dot] or [dot] us)


In response to your question have two guesses for this bridge.

The first is the easy guess.

The bridge was moved to this location in 1975.

A couple of factors would lead one to this conclusion. First, judging by the design of the bridge, mainly the riveted connections and the riveted built-up sections I would estimate this truss to have been fabricated much earlier than 75. The second factor would be Siskiyou Countyís history of using recycled bridges. These two main factors would lead me to guess that the bridge was in fact moved here in 1975.

The second guess is a little more of a stretch.

I know that this data is from the National Bridge Inventory (NBI). I also know if you change too many of the core bridge elements (change the deck material, rehabilitate the truss, rebuild the bridge or a majority of it) the date of construction may be reset to the rehabilitation date in the NBI.

So it could be that the bridge was overhauled in 1975 and the date now reads as built in that year.

I would lean towards the bridge was moved here in 1975, as oppose to the other. This was probably more of an answer that you wanted but thatís my take on this particular structure.

French Creek Road Bridge
Posted March 22, 2010, by Craig Philpott (cphilpott [at] puc [dot] edu)

Michael, I am not fully familiar with steel truss history, but I would like to know, in your opinion, was this bridge first constructed in 1975 for this location, or, was it moved to this location in 1975?