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I Street Bridge

I Street Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: April 5, 2013

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Key Facts

Facility Carried / Feature Intersected
I Street and Railroad (Southern Pacific) Over Sacramento River
Sacramento and West Sacramento: Sacramento County, California and Yolo County, California: United States
Structure Type
Metal Rivet-Connected Baltimore Through Truss, Movable: Swing (Center Bearing Center Pier) and Approach Spans: Metal Rivet-Connected Baltimore Deck Truss, Fixed
Construction Date and Builder / Engineer
1911 By Builder/Contractor: American Bridge Company of New York, New York and Engineer/Design: John D. Isaacs

Technical Facts

Rehabilitation Date
Main Span Length
195 Feet (59.4 Meters)
Structure Length
854 Feet (260.3 Meters)
Roadway Width
18 Feet (5.49 Meters)
1 Main Span(s) and 3 Approach Span(s)
NBI Number

Historic Significance Rating (HSR)
View Information About HSR Ratings

Bridge Documentation

This bridge's future is at risk!

Bridge Status: The Future of This Historic Bridge Is Uncertain And Demolition Is A Possibility!

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

View Historical Biography of Engineer John D. Isaacs

View National Register of Historic Places Nomination Form For This Historic Bridge

This bridge is a very rare example of a double-deck swing bridge. The bridge is also the oldest of the remaining swing bridges on California highways. The lower deck carries railroad traffic and the upper deck carries vehicular traffic. The "I Street Bridge" proper contains three fixed deck truss spans and a through truss swing bridge. This bridge's length and dimensions are included in the Technical Facts table above. However, for vehicular traffic, the overall bridge also includes from the west a curved approach system dating to 1959 and to the east, there are two approach ramps, an interesting ramp bridge on Jibboom Street dating to 1937, which intersects the approach at a 90 degree angle, and also a straight-on approach leading east away from the bridge.

Aside from the newer nature of the approach spans, the truss spans themselves retain good historic integrity with no major alterations. In terms of design style and appearance, this combined highway and railroad bridge has the appearance of a railroad bridge. The bridge was actually designed by John D. Isaacs for the Southern Pacific Railroad. The American Bridge Company of New York, New York constructed the superstructure, with the Missouri Valley Bridge and Iron Company of Leavenworth, Kansas constructing the substructure.

In 2013, an announcement was made that federal funding assistance was approved for the replacement of this historic bridge which is listed on the National Register of Historic Places with a new vehicular bridge. This will require a Section 106 Review to consider alternatives to demolition of the historic bridge. HistoricBridges.org looks forward to a broad, detailed consideration of numerous alternatives that are available to avoid or minimize adverse effect to the historic bridge. Demolition of this highly rare bridge (which remains in good structural condition despite the poor condition of the paint system) is something that appears to be avoidable, even if it means leaving the historic bridge standing for pedestrian use next to a replacement bridge.


Photo Galleries and Videos: I Street Bridge

View Photo Gallery
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
View Photo Gallery
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: Westbound Crossing
Full Motion Video
The video includes the approach to the bridge via Jiboom Street. 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.


Maps and Links: I Street Bridge

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