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Crocker Road Bridge

Cloverdale Bridge

   


Crocker Road Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: April 8, 2013
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Key Facts

Facility Carried / Feature Intersected
Crocker Road Over Russian River
Location
Cloverdale: Sonoma County, California
Structure Type
Metal 10 Panel Rivet-Connected Polygonal Warren Pony Truss, Fixed and Approach Spans: Metal Pin and Hanger Stringer (Multi-Beam), Fixed
Construction Date and Builder / Engineer
1938 By Builder/Contractor: Unknown

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
120 Feet (36.6 Meters)
Structure Length
528 Feet (160.9 Meters)
Roadway Width
23.3 Feet (7.1 Meters)
Spans
3 Main Span(s) and 4 Approach Span(s)
NBI Number
20C0002

Historic Significance Rating (HSR)

Bridge Documentation

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

This bridge was built in 1938, but because its trusses do not use built-up beams and composed of only rolled beams, the bridge looks newer than it is. The bridge includes steel stringer approach spans that include a suspended spans with a pin and hanger detail.

The bridge in more recent years had its substructure completely replaced. The new piers are massive and considerably wider than the historic trusses that were placed back on the piers. This is somewhat alarming since it suggests that a long term plan is to demolish the historic trusses and place a new, wider substructure on these piers.

The bridge has seismic retrofits added it it. If the bearing hinge pins on this bridge's truss spans fail during an earthquake, the truss will drop a tiny distance, bringing a backup fixed bearing (attached to the bottom chord) to rest on a raised platform on the concrete abutment. For the steel stringer spans, a retrofit is added around the rocker bearings. If an earthquake causes motion that attempts to force the rocker to move beyond its designed distance, special pieces of steel welded to the bottom of the stringers on either side of the pier will bump into the pier, preventing the superstructure from moving too far.

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Photos and Videos: Crocker Road Bridge

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Bridge Photo-Documentation
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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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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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