US 90 Calcasieu River Bridge
Photo taken by Douglas Butler in April 2013
BH Photo #288779
& another from the same Employee's Bulletin. Bridge described as reinforced concrete connector of the Old Spanish Trail highway.
There is a very good description and photographic reproduction of the bridge's bascule section in the January 1917 issue of the Employees' Bulletin of Robert W. Hunt & Company, Engineers. [public domain].