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Kilburn Road Bridge

Kilburn Road Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: April 5, 2013

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Key Facts

Facility Carried / Feature Intersected
Kilburn Road Over Orestimba Creek
Location
Rural: Stanislaus County, California: United States
Construction Date and Builder / Engineer
1918 By Builder/Contractor: Unknown and Engineer/Design: D. M. McPhetres

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
60 Feet (18.29 Meters)
Structure Length
62 Feet (18.9 Meters)
Roadway Width
19.7 Feet (6 Meters)
Spans
1 Main Span(s)
NBI Number
38C0168

Historic Significance Rating (HSR)

Bridge Documentation

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

This historic bridge is at risk for demolition and replacement in 2016!

This bridge is a very unusual bridge with an unusual history. Although it looks like a concrete truss bridge, it actually is a steel truss that was reused by encasing it with reinforced concrete. The bridge is not a simple concrete-encased metal truss bridge because not only was concrete added around the metal truss, a substantial amount of reinforcing rods and wires were added alongside the truss within the concrete. The steel truss and reinforcing rod system work together to give the bridge its load-bearing capacity. Therefore, the best way to think of the bridge today is a combination of a reinforced concrete truss and a steel truss. The metal truss was reportedly built in 1910. The bridge as seen today was constructed in 1918. If the date for the metal truss is correct, it did not have a long service life. Based on the original plans for the bridge, the metal truss structure was a very lightweight structure composed mostly of paired angles. It likely did not take the county long to realize that the truss was not very strong and would be better served by strengthening it to enable it to reliably carry heavier loads. The steel truss itself is a Warren truss, but it is not subdivided. When the concrete strengthening project took place, the bridge was turned into a subdivided Warren truss by adding verticals and floor beams. Therefore, every other vertical member and floor beam is pure reinforced concrete with no steel truss component inside.

Thanks are due to Stanislaus County for providing a copy of an original 1918 plan sheet for this bridge, which unraveled the mystery behind this unique bridge. HistoricBridges.org adapted the below diagram from this plan sheet to show the parts and construction of this bridge.

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Photo Galleries and Videos: Kilburn Road Bridge

 
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Bridge Photo-Documentation
Original / Full Size Photos
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
View Video
CarCam: Southeastbound 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.
View Video
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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