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Lacon Bridge

Lacon Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: April 13, 2013

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and Videos
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Key Facts

Facility Carried / Feature Intersected
IL-17 (5th Street, Ferry Street) Over Illinois River
Lacon and Sparland: Marshall County, Illinois: United States
Structure Type
Metal Continuous Rivet-Connected Warren Through Truss, Fixed and Approach Spans: Metal Stringer (Multi-Beam), Fixed
Construction Date and Builder / Engineer
1939 By Builder/Contractor: Unknown

Technical Facts

Rehabilitation Date
Main Span Length
378 Feet (115.2 Meters)
Structure Length
1,573 Feet (479.5 Meters)
Roadway Width
26.2 Feet (7.99 Meters)
3 Main Span(s) and 8 Approach Span(s)
NBI Number

Historic Significance Rating (HSR)
View Information About HSR Ratings

Bridge Documentation

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

This bridge has a distinctive appearance because its top chord and end posts visually seem comparatively smaller than one would expect to the point where they do not look much larger or heavier than the other truss members. As such, from a visual standpoint, all the members and chords on the bridge look to be about the same size. This is quite different from a traditional bridge of this design.

This is one of those bridges that looks exactly like a cantilever truss, with a variable depth truss forming "towers" over the piers, however it appears to lack hinges which means that it functions as a continuous truss, not a cantilever truss. As such, it does not have a suspended span.

A series of steel stringer spans provide an approach to the through truss spans.

HistoricBridges.org currently only has a partial photo-documentation of this bridge. Missing are detail photos taken from on the bridge.

Above: These photos taken in 1937 show the previous bridge at this location shortly before it was replaced. It was a pontoon swing bridge. A metal pony truss approach span is also visible.

Above: This photo shows the previous pontoon bridge swung open for boats to the right in the photo.

Above: Taken in 1939, these photos show the current bridge shortly after it was completed.


Photo Galleries and Videos: Lacon 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
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
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: Lacon Bridge

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