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Jimtown Bridge

   


Jimtown Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: April 8, 2013
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Key Facts

Facility Carried / Feature Intersected
Alexander Valley Road Over Russian River
Location
Rural: Sonoma County, California
Structure Type
Metal Continuous 10 Panel Rivet-Connected Warren Pony Truss, Fixed and Approach Spans: Concrete Cantilever Girder, Fixed
Construction Date and Builder / Engineer
1949 By Builder/Contractor: Judson Pacific Murphy Company

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
120 Feet (36.6 Meters)
Structure Length
1384 Feet (421.8 Meters)
Roadway Width
26.6 Feet (8.1 Meters)
Spans
5 Main Span(s) and 30 Approach Span(s)
NBI Number
20C0006

Historic Significance Rating (HSR)

Bridge Documentation

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

View A Historical Article About This Bridge

This is a bridge with some very unusual designs. Its continuous pony truss spans are most noteworthy. The continuous truss spans have "towers" at the pier points making the bridge look like a cantilevered truss, although the spans appear to be rigid and functioning as continuous (no suspended spans). The long series of approach spans at the northeastern end of the bridge are another story. Eight of the spans are curved concrete deck girders, located immediately after the truss spans. These spans have three girder lines under the deck. These girder spans include a cantilevered design. The remaining approach spans at the northeastern end of the bridge are all concrete slab spans, 19 in total.

An earlier bridge at this location mostly collapsed in the 1906 earthquake. It included a pin-connected through truss design. Based on the description of the bridge that this 1949 bridge replaced it appears that what was left of the bridge after the 1906 earthquake was repaired and/or rebuilt with similar details. Remains of caissons from this previous bridge remain below the bridge to this day.

 

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Photos and Videos: Jimtown Bridge

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CarCam: Northwestbound 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: Northeastbound 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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