Port is fifth busiest in nation with ships from nearly every country in the world. Major cargoes are oil and refined products, grain, cotton, and chemicals. The harbor entrance is spanned by an impressive bridge (U.S. 181) that arches 235 feet above the water. Pedestrian walkway on bridge has spectacular views of harbor and city. Beneath the bridge is an observation platform offering close-up views of ships entering and leaving the port. New Solomon P. Ortiz International Center.