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Gualala Road Bridge

Gualala Road Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: April 8, 2013


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Key Facts

Facility Carried / Feature Intersected
Gualala Road Over North Fork Gualala River
Location
Rural: Mendocino County, California: United States
Structure Type
Metal 7 Panel Pin-Connected Pratt Through Truss, Fixed and Approach Spans: Wood Stringer (Multi-Beam), Fixed
Construction Date and Builder / Engineer
By Builder/Contractor: Unknown

Technical Facts

Rehabilitation Date
1940
Main Span Length
130 Feet (39.62 Meters)
Structure Length
187 Feet (57 Meters)
Roadway Width
10.5 Feet (3.2 Meters)
Spans
1 Main Span(s) and 3 Approach Span(s)
NBI Number
10C0046

Historic Significance Rating (HSR)

Bridge Documentation

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

This bridge is an exceedingly rare and highly significant example of a truss bridge 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. However neighboring Sonoma County has two similar bridges. Those two bridges and this bridge all have been relocated from a previous site at around the same time and all three have the same span length and as such they likely have a shared history, perhaps having one been part of a multi-span bridge.

This bridge has a National Bridge Inventory date of 1940, which likely refers to the relocation date. The bridge rests on steel i-beam bents, but the southern end of the truss also has riveted steel caissons as part of the substructure system. Riveted steel plate caissons with concrete inside were used on many early 20th Century bridges. However, the metal casing for these caissons have holes and handles on them which makes it look like they may in reality be salvaged parts from a boiler or something similar.

Overall the bridge has excellent historic integrity, and the trusses remain in good structural condition as well.

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Photos and Videos: Gualala Road Bridge

Available Photo Galleries and Videos

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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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Bridge Photo-Documentation
Mobile Optimized Gallery
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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View Video
CarCam: Approaching Roadway and Bridge 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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