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Wohler Bridge

Wohler Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: April 8, 2013

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Key Facts

Facility Carried / Feature Intersected
Wohler Road Over Russian River
Location
Rural: Sonoma County, California: United States
Structure Type
Metal 10 Panel Pin-Connected Parker Through Truss, Fixed and Approach Spans: Concrete Stringer (Multi-Beam), Fixed
Construction Date and Builder / Engineer
1921 By Builder/Contractor: American Bridge Company of New York, New York

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
230 Feet (70.1 Meters)
Structure Length
768 Feet (234.09 Meters)
Roadway Width
16.7 Feet (5.09 Meters)
Spans
1 Main Span(s)
NBI Number
20C0155

Historic Significance Rating (HSR)

Bridge Documentation

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

This bridge is an uncommon example of a pin-connected Parker truss. It also is noted for its multi-span configuration, with three main spans. The ends of the bridge also have concrete approach spans with balustrade railings. The bridge truss configuration is unusual in that with the two center panels of the truss, the diagonal members pass through two panels instead of just one which is the case with the other panels on the truss. The center panels make the bridge look like a Pennsylvania truss, although the other panels do not display this design, which is why the bridge is being classified as a Parker and not a Pennsylvania truss. The truss retains original lattice railings. The good news with this bridge is that Sonoma County apparently does not plan to demolish and replace the bridge, since the bridge is listed as being slated for seismic retrofit when funds become available.

The bridge was built by the American Bridge Company with the Foundation Company listed as a contractor (likely for the substructure). The bridge was designed by Sonoma County Engineer W. L. Hook.

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Photo Galleries and Videos: Wohler Bridge

 
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Bridge Photo-Documentation
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A collection of overview and detail photos. This gallery offers photos in the highest available resolution and file size in a touch-friendly popup viewer. Alternatively, Browse Without Using Viewer
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Bridge Photo-Documentation
Mobile Optimized Photos
A collection of overview and detail photos. This gallery features data-friendly, fast-loading photos in a touch-friendly popup viewer. Alternatively, Browse Without Using Viewer
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CarCam: Westbound 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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