3 votes

Geysers Road Bridge


Geysers Rd

Looking SE

Photo taken by Craig Philpott in September 2009


BH Photo #145900


Street Views 


Highway sign says, "Built 1909, relocated 1937"


Pratt Through truss bridge over Big Sulphur Creek on Geysers Road
Sonoma County, California
Open to traffic
Future prospects
Slated for "seismic replacement" upon funds becoming available. Bridge will be bypassed and abandoned.
Built 1909; rehabilitated 1970
- Phoenix Iron Works of Phoenixville, Pennsylvania
- Rail-to-road
Pin Connected Pratt Through truss with Phoenix columns
Length of largest span: 129.9 ft.
Total length: 149.0 ft.
Deck width: 13.1 ft.
Vertical clearance above deck: 21.3 ft.
Eligible for the National Register of Historic Places
Approximate latitude, longitude
+38.82355, -122.88342   (decimal degrees)
38°49'25" N, 122°53'00" W   (degrees°minutes'seconds")
Approximate UTM coordinates
10/510119/4297203 (zone/easting/northing)
Quadrangle map:
Inventory numbers
CA 20C-5 (California bridge number)
BH 11612 (Bridgehunter.com ID)
Inspection (as of 07/2015)
Deck condition rating: Very Good (8 out of 9)
Superstructure condition rating: Satisfactory (6 out of 9)
Substructure condition rating: Good (7 out of 9)
Appraisal: Functionally obsolete
Sufficiency rating: 61.7 (out of 100)
Average daily traffic (as of 2008)

Update Log 

  • July 21, 2017: New Street View added by Clark Vance
  • July 20, 2017: New video from Craig Philpott
  • September 22, 2015: Updated by Luke: Added categories "Relocated", "Pin-connected", "Phoenix columns", "Phoenix Iron Works", "Rail-to-road"
  • July 2, 2013: Updated by Nathan Holth: New information from county: Bridge to be bypassed and abandoned.
  • June 13, 2013: Updated by Nathan Holth: This bridge is now doomed.
  • March 6, 2012: New photos from Craig Philpott
  • May 15, 2010: New Street View added by Craig Philpott
  • March 22, 2010: Updated by Craig Philpott: refined design description
  • March 1, 2010: Updated by Craig Philpott: Amended design
  • February 19, 2010: Updated by Craig Philpott: Corrected design
  • September 7, 2009: New photos from Craig Philpott

Related Bridges 



Geysers Road Bridge
Posted September 22, 2015, by Daniel (danielaketchum [at] gmail [dot] com)

This article states that Hauser Bridge is from the same original location. This seems unlikely, as Hauser is a Bailey Bridge built in the late 40s and this was probably 1870s or 1880s. John Charles Stutz says that Geysers Road Bridge is from the same project, and that makes sense. I don't know where the pre-1984 South Fork Gualala River Bridge was - is this around 3.4mi by road West, also on Stewarts Point Skaggs Springs Road?

Geysers, Haupt Creek & North Fk Guauala Road Bridges
Posted February 11, 2014, by John Charles Stutz (john [dot] c [dot] stutz [at] nasa [dot] gov)

The Geysers Road, the Haupt Creek bridge, and the pre-1984 South Fork Guauala River bridge, are all typical 1870's era railroad bridges. Cal Trans documents mention drawings initialled GH&SA RR, suggesting the Southern Pacific's Texas subsidiary, and these spans are typical of those installed by the SP during initial construction of the Sunset and Oregon routes.

The 1909 build date quoted for the Geysers span, is actually when these spans were recycled to the NWP RR's Russian River branch, and installed above Monte Rio as a 3-span crossing. In the same time frame, similar spans were re-erected on the former NPCRR at Tomalas Estuary and Papermill Creek, and the Guauala RR's crossing of the North Fork. The later span still stands on the circa 1910 steel cylindrical piers, but was raised clear of the flood plain circa 1940.

Geysers Road Bridge
Posted June 27, 2012, by Gail Johnson (gailjohnson [at] vom [dot] com)

I am wondering if you are aware that the Sonoma County Dept of Transportation has this bridge slated for seismic replacement along with Lambert Road Bridge, Watmaugh Road Bridge,and Chalk Hill Road Bridge. Any information you can supply as an argument against this would be helpful.

Geysers Road Bridge
Posted September 7, 2009, by Anthony Dillon (spansaver [at] hotmail [dot] com)

I agree Robert....those do look like Phoenix Columns. Perhaps the bridge was relocated twice!

Geysers Road Bridge
Posted September 7, 2009, by Robert Elder (robertelder1 [at] gmail [dot] com)

It appears that this bridge is constructed from columns, making it look much older then 1909.