Not only is this an early surviving example of a concrete arch bridge this is also an extremely long example, making it a major engineering achievement when completed. Many sources claimed it to be the longest in the world, however for that to be completely accurate qualifiers such as "highway bridge" would be required since the Long Key Viaduct, at that time a railroad bridge, far exceeded the length of this bridge and was also a concrete arch bridge, and even one which is called a "viaduct."
Most of the bridge consists of concrete arch spans. There are also concrete encased steel stringer spans and concrete t-beam spans. This is one of those bridges which is difficult to classify since most people would look at this bridge and describe the "main spans" as the concrete arch spans, and that is how it is listed here. However these "main spans" are not the longest spans. One of the concrete encased stringer spans is actually the longest span on the bridge, and it is 103 feet in span length. This span crosses the old alignment of the river, and it was intended to allow marine navigation which was a fantasy the city had for this river for many years. Meanwhile, the total length provided on HistoricBridges.org is the length given in engineering periodicals of the period. It is slightly longer than the 4,774 foot length given in the National Bridge Inventory.
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