HistoricBridges.org Menu: HistoricBridges.org Menu:

We Recommend These Resources:
Bach Steel - Experts at historic truss bridge restoration.

HistoricBridges.org: Bridge Browser

Green Bay Road Bridge

Green Bay Road Trusses

Green Bay Road Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: April 14, 2013

View Photos
and Videos
View Maps
and Links

Key Facts

Facility Carried / Feature Intersected
Green Bay Road Over Railroad (Union Pacific)
Lake Bluff: Lake County, Illinois: United States
Construction Date and Builder / Engineer
By Builder/Contractor: Unknown

Technical Facts

Rehabilitation Date
Main Span Length
70 Feet (21.3 Meters)
Structure Length
170 Feet (51.8 Meters)
Roadway Width
26 Feet (7.92 Meters)
3 Main 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 was sadly demolished and replaced in 1988, however the only good news is that the extremely unusual and highly significant truss webs of the bridge were placed on the replacement bridge as decorations. These trusses have several unusual details. The double-Warren truss configuration is unusual, especially in the Chicagoland area. However the most unusual feature is what looks like "archways" over the cantilevered sidewalks. Although these elements include decorative knee braces with punch-out decorations, these "archways" are not decorative features. They are actually the outriggers for the pony truss, designed to provide lateral stability. The use of outriggers was a common way to stabilize pony trusses that did not get enough lateral stability from the trusses themselves. However, if it was desired to design a pony truss with outriggers, but also with cantilevered sidewalks, a practical problem developed. The outriggers would stick out into the sidewalk, or the sidewalk would have to be extended out beyond the outriggers which would be an inefficient design. As such, the designers of this bridge simply placed the outriggers outside of the cantilevered sidewalk, and connected them to the top of the truss via overhead beams. This produced the "archways" seen on the bridge.

Based on style, the bridge could be as old as the 1890s. If so, it is also significant as an early surviving example of a rivet-connected truss bridge.

The bridge trusses make efficient use of materials at the expense for a more complicated design. Diagonal members become increasingly lightweight toward the center of the truss, representing the distribution of loads within the truss web.

Note: The bridge dimensions given are for the replacement bridge. The length, width and span number of the historic bridge would have been different. The bridge is likely wider than the original, and where the current bridge is three spans, the original bridge may have been single span (just the truss) or there may have been flanking approach spans of some sort.


Photo Galleries and Videos: Green Bay Road 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


Maps and Links: Green Bay Road Bridge

Coordinates (Latitude, Longitude):

View Bridge Location In:

Bridgehunter.com: View listed bridges within a half mile of this bridge.

Bridgehunter.com: View listed bridges within 10 miles of this bridge.

Google Maps

Google Streetview (If Available)

Bing Maps


Apple Maps (Via DuckDuckGo Search)

Apple Maps (Apple devices only)


HERE We Go Maps

ACME Mapper

Waze Map

Android: Open Location In Your Map or GPS App

Flickr Gallery (Find Nearby Photos)

Wikimedia Commons (Find Nearby Photos)

Directions Via Sygic For Android

Directions Via Sygic For iOS and Android Dolphin Browser

USGS National Map (United States Only)

Historical USGS Topo Maps (United States Only)

CalTopo Maps (United States Only)

Home Top


About - Contact

© Copyright 2003-2021, HistoricBridges.org. All Rights Reserved. Disclaimer: HistoricBridges.org is a volunteer group of private citizens. HistoricBridges.org is NOT a government agency, does not represent or work with any governmental agencies, nor is it in any way associated with any government agency or any non-profit organization. While we strive for accuracy in our factual content, HistoricBridges.org offers no guarantee of accuracy. Information is provided "as is" without warranty of any kind, either expressed or implied. Information could include technical inaccuracies or errors of omission. Opinions and commentary are the opinions of the respective HistoricBridges.org member who made them and do not necessarily represent the views of anyone else, including any outside photographers whose images may appear on the page in which the commentary appears. HistoricBridges.org does not bear any responsibility for any consequences resulting from the use of this or any other HistoricBridges.org information. Owners and users of bridges have the responsibility of correctly following all applicable laws, rules, and regulations, regardless of any HistoricBridges.org information.

Admin Login