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Jack Glass Road Bridge

Jerico Road Bridge

Jack Glass Road Bridge

Primary Photographer(s): Dave Michaels

Bridge Documented: June 17, 2007

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Key Facts

Facility Carried / Feature Intersected
Jack Glass Road (Jerico Road) Over Apalachee River
Rural: Walton County, Georgia and Barrow County, Georgia: United States
Construction Date and Builder / Engineer
1930 By Builder/Contractor: Leamon and Evans of Atlanta, Georgia

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
80 Feet (24.3 Meters)
Structure Length
80 Feet (24.3 Meters)
Roadway Width
9.8 Feet (2.99 Meters)
1 Main Span(s)
NBI Number

Historic Significance Rating (HSR)
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Bridge Documentation

This bridge is an example of a bridge that demonstrates the transition from built-up beams to rolled beams for use in bridge work. Earlier in the history of iron and steel bridges, built-up beams were employed because the mills were incapable of rolling beams as large as were needed for a bridge. As such, rolled beams would only be found for smaller structural elements on a bridge, and/or riveted to other rolled beams when forming a built-up beam. The Jack Glass Road Bridge, constructed in 1930 is different however. In this case, the largest beams, the top chord and end post, are rolled, while all the other smaller truss members are built-up beams. This suggests a period in which the mills were capable of rolling large beams, but at a higher cost, and as such, built-up beams remained less expensive. As a result, with this bridge, builders selected a rolled beam for the top chord, which would have been stronger and more reliable than a built-up beam, while employing the less expensive rolled beams for the other members. The bridge harkens back to a time where labor was cheap and materials were expensive. As such, even though it would take a lot more time and workers to create a built-up beam, the cost of hiring such work was made up for by the savings in materials. Today, this is usually the opposite.


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