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Geysers Road Bridge

   


Geysers Road Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: April 8, 2013
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Key Facts

Facility Carried / Feature Intersected
Geysers Road Over Big Sulphur Creek
Location
Rural: Sonoma County, California
Construction Date and Builder / Engineer
By Builder/Contractor: Unknown

Technical Facts

Rehabilitation Date
1937
Main Span Length
130 Feet (39.6 Meters)
Structure Length
149 Feet (45.4 Meters)
Roadway Width
13 Feet (4 Meters)
Spans
1 Main Span(s)
NBI Number
20C0005

Historic Significance Rating (HSR)

Bridge Documentation

View Archived National Bridge Inventory Report - Has Additional Details and Evaluation

This bridge is to be replaced under a "seismic replacement" program, but will be left in place next to its replacement!

This bridge is one of two exceedingly rare and highly significant examples in Sonoma County of truss bridges with Phoenix columns, a unique type of built-up beam invented, patented, and produced by the Phoenix Iron Company. Bridges containing them were usually built by the Phoenix Bridge Company of Phoenixville, Pennsylvania or Dean and Westbrook of New York, New York. Also, most of the small number of surviving Phoenix column bridges are in the northeastern United States. Surviving examples in the western United States are exceptionally rare.

The sign at the bridge states that the bridge was built in 1909 and relocated to this site in 1937. However, 1909 would be exceedingly late for an initial construction of a Phoenix column bridge. It is likely that the initial construction is even earlier. Perhaps the 1909 date also refers to a relocation which would suggest the bridge has been moved twice over its life.

Overall the bridge has good historic integrity, although one end post has had modern steel added to it, and the portal bracing knees are not original. One end of the bridge deck has a cattle guard. Cables wrapped around the base of the end post and run into the concrete abutments to hold the bridge in place during an earthquake.

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Photos and Videos: Geysers Road Bridge

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Bridge Photo-Documentation
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A collection of overview and detail photos. For the best visual immersion and full detail, or for use as a desktop background, this gallery presents the photos for this bridge in the original digital camera resolution.
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A collection of overview and detail photos. View the photos for this bridge in a reduced size which is useful for mobile/smartphone users, modem (dial-up) users, or those who do not wish to wait for the longer download times of the full-size photos. Alternatively, view this photo gallery using a popup slideshow viewer (great for mobile users) by clicking the link below.
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CarCam: Eastbound Crossing
Full Motion Video
Note: The downloadable high quality version of this video (available on the video page) is well worth the download since it offers excellent 1080 HD detail and is vastly more impressive than the compressed streaming video. Streaming video of the bridge. Also includes a higher quality downloadable video for greater clarity or offline viewing.

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