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.
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|
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|
Coordinates (Latitude, Longitude):
View Bridge Location In:
© 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.