View this photo at suspensiondomes.com
BH Photo #239814
Being from Louisiana, and spending much time on the waterways, I have seen these pipeline crossings many times. I always wondered if it was oil or natural gas that goes through these suspended pipelines. Also, why not bury them like many others? Scouring problems? It seems more expensive this way.
possibly this bridge was designed by Ben L. Goepfert, P.E. for Shell Oil Company, based on information provided by another Shell engineer. Mr. Goepfert, my father-in-law, enjoyed a lengthy career with Shell, from the early 1950's to 1980's.
thanks for the posting and any additional information.